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    <front>
        <journal-meta>
            <journal-id journal-id-type="issn">2050-5833</journal-id>
            <journal-title-group>
                <journal-title>Architectural Histories</journal-title>
            </journal-title-group>
            <issn pub-type="epub">2050-5833</issn>
            <publisher>
                <publisher-name>Ubiquity Press</publisher-name>
            </publisher>
        </journal-meta>
        <article-meta>
            <article-id pub-id-type="doi">10.5334/ah.343</article-id>
            <article-categories>
                <subj-group>
                    <subject>Research article</subject>
                </subj-group>
            </article-categories>
            <title-group>
                <article-title>The Life and Death of Residential Room Types: A Study of Swedish
                    Building Plans, 1750&#8211;2010</article-title>
            </title-group>
            <contrib-group>
                <contrib contrib-type="author">
                    <contrib-id contrib-id-type="orcid"
                        >http://orcid.org/0000-0002-4971-2733</contrib-id>
                    <name>
                        <surname>K&#228;rrholm</surname>
                        <given-names>Mattias</given-names>
                    </name>
                    <email>mattias.karrholm@arkitektur.lth.se</email>
                    <xref ref-type="aff" rid="aff-1">1</xref>
                </contrib>
            </contrib-group>
            <aff id="aff-1"><label>1</label>Department of Architecture and Built Environment, Lund
                University, SE</aff>
            <pub-date publication-format="electronic" date-type="pub" iso-8601-date="2019-01-02">
                <day>02</day>
                <month>01</month>
                <year>2020</year>
            </pub-date>
            <pub-date pub-type="collection">
                <year>2020</year>
            </pub-date>
            <volume>8</volume>
            <issue>1</issue>
            <elocation-id>1</elocation-id>
            <permissions>
                <copyright-statement>Copyright: &#x00A9; 2020 The Author(s)</copyright-statement>
                <copyright-year>2020</copyright-year>
                <license license-type="open-access"
                    xlink:href="http://creativecommons.org/licenses/by/4.0/">
                    <license-p>This is an open-access article distributed under the terms of the
                        Creative Commons Attribution 4.0 International License (CC-BY 4.0), which
                        permits unrestricted use, distribution, and reproduction in any medium,
                        provided the original author and source are credited. See <uri
                            xlink:href="http://creativecommons.org/licenses/by/4.0/"
                            >http://creativecommons.org/licenses/by/4.0/</uri>.</license-p>
                </license>
            </permissions>
            <self-uri xlink:href="http://journal.eahn.org/articles/10.5334/ah.343/"/>
            <abstract>
                <p>While the study of building types is a well-known and relatively active research
                    field, the topic of room types is less explored. This article takes a broad
                    approach to spatial categorization, enabling the examination of different types
                    of spaces over longer periods. How do different room types evolve and die? How
                    do the different residential room types relate to each other? Do they act alone
                    or do they follow each other over time? The article looks at the particular
                    evolution and development of Swedish residential room types and is based on the
                    study of plans of 2,340 Swedish buildings from about 1750 to 2010. Six themes
                    emerged from this study: thresholds of birth and extinction, abruptive change,
                    the relation between absent and present room types, contagious types, different
                    temporal scales and the stabilization of prototypical sets.</p>
            </abstract>
        </article-meta>
    </front>
    <body>
        <sec>
            <title>Introduction</title>
            <p>Spatial entities can be classified into different types of rooms. These types are
                often used in building programmes and briefs (<xref ref-type="bibr" rid="B61">Markus
                    and Cameron 2002</xref>), and to set the plan of buildings, buildings that
                subsequently are aggregated into urban areas, and urban areas into cities. Room
                types here play an important part in how we behave in everyday life (for example,
                justifying certain restrictions, such as &#8216;quiet, this is a reading
                room&#8217;), and they take part in the transformation of objects and cultures of
                different scales. Like the classification of building types, the naming and
                designing of room types is a matter of territorialising specific kinds of spaces
                    (<xref ref-type="bibr" rid="B40">K&#228;rrholm 2013</xref>), and as such, types
                of rooms participate in the controlling and ordering of movements and behaviour
                (Sack 1986). However, whereas the study of building types is a well-known and active
                research field (<xref ref-type="bibr" rid="B60">Markus 1993</xref>; <xref
                    ref-type="bibr" rid="B31">Forty 2000</xref>; <xref ref-type="bibr" rid="B75"
                    >Scheer 2010</xref>; <xref ref-type="bibr" rid="B35">Guggenheim and
                    S&#246;derstr&#246;m 2009</xref>; <xref ref-type="bibr" rid="B80">Steadman
                    2014</xref>; <xref ref-type="bibr" rid="B39">Karlsmo and L&#246;fgren
                    2016</xref>), the topic of room types has received less scrutiny. Research on
                residential room types is so far a quite fragmented field, encompassing everything
                from general and specific design guidelines (<xref ref-type="bibr" rid="B65">Neufert
                    1936</xref>) to more descriptive and historical writings on room types (<xref
                    ref-type="bibr" rid="B6">Barley 1963</xref>; <xref ref-type="bibr" rid="B64"
                    >Muthesius 1979</xref>; <xref ref-type="bibr" rid="B32">Gejvall 1988</xref>). It
                also includes research on the relationships of room types and their spatial
                distribution within dwellings (<xref ref-type="bibr" rid="B37">Hanson 1999</xref>;
                    <xref ref-type="bibr" rid="B66">Nylander 2013</xref>). In general, literature on
                residential room types has often focused on a specific historical, typological and
                geographical setting, such as large country houses in Sweden (<xref ref-type="bibr"
                    rid="B77">Selling 1937</xref>), England (<xref ref-type="bibr" rid="B33"
                    >Girouard 1978</xref>) or Ireland (<xref ref-type="bibr" rid="B62">MacCarthy
                    2016</xref>); bourgeois apartments in Stockholm during the 19th century (<xref
                    ref-type="bibr" rid="B32">Gejvall 1988</xref>); Victorian homes (<xref
                    ref-type="bibr" rid="B34">Girouard 1979</xref>; <xref ref-type="bibr" rid="B29"
                    >Flanders 2004</xref>); or the room types of specific rural contexts (<xref
                    ref-type="bibr" rid="B27">Erixon 1947</xref>; <xref ref-type="bibr" rid="B6"
                    >Barley 1963</xref>; <xref ref-type="bibr" rid="B37">Hansson 1999</xref>).</p>
            <p>I look at the evolution and development of residential room types and how they relate
                to each other. The article can thus be seen as an initial investigation of some
                general themes of room type transformation: How do different room types evolve and
                die? How do different residential room types interrelate? Do they act alone, or do
                they follow each other over time? Sweden provides an interesting case study, since
                the country underwent an unusual, quick, thorough and dramatic modernization (and
                urbanization) during the 20th century, and so trends in transformation can be easily
                identified. However, this transformation is set within the broader historical
                context of the modern era of architecture, starting (as suggested, for example, by
                    <xref ref-type="bibr" rid="B19">Collins 1965</xref>) around 1750. The article is
                thus based on a study of 2,340 building plans of Swedish buildings from about 1750
                to 2010. It explores different themes that emerge about the transformation of room
                types and ends with six ways that room types intermingle and come and go.</p>
        </sec>
        <sec>
            <title>Spatial Types, Room Types and Territorial Sorts</title>
            <p>In this article I discuss type as a spatial category that matters in <italic>everyday
                    use</italic>. I do thus not follow the morphological conception of type,
                sometimes called <italic>form</italic> type, that can be found, for example, in the
                famous studies of Jean-Nicolas-Louis Durand (<xref ref-type="bibr" rid="B22">2000
                    [1802&#8211;5]</xref>) and Saverio Muratori (<xref ref-type="bibr" rid="B63"
                    >1959</xref>). Since form and use must be studied together, it is better not to
                employ the more common notion of <italic>use</italic> type (<xref ref-type="bibr"
                    rid="B75">Scheer 2010: 10</xref>; <xref ref-type="bibr" rid="B80">Steadman 2014:
                    354</xref>). Rather, I follow Steadman&#8217;s more general definition of
                building type as &#8216;a classificatory unit by which similar buildings can be
                grouped and enumerated&#8217; (<xref ref-type="bibr" rid="B80">2014: 353</xref>). To
                this definition I would add a more pragmatic perspective: a type is also always a
                kind of <italic>actor</italic>, something that has an effect (<xref ref-type="bibr"
                    rid="B50">Latour 2005</xref>) in an everyday life situation. A certain type of
                space, such as a bathing place, might come in a variety of different forms and host
                a series of different functions (<xref ref-type="bibr" rid="B18">Carl 2011</xref>).
                However, it is because someone recognizes it as a bathing place and uses it
                accordingly that it makes a difference in our everyday life. Both social (who can
                bathe and how?) and material aspects (what kind of bathing does this specific place
                afford?) have their role to play, and these roles are interdependent. Issues of form
                have often been distinguished from issues of activity or use, so that the difference
                between single-family detached houses and row houses has do with form, whereas that
                between student housing and elderly housing is about use. One problem with putting a
                focus on either use or form is that it tends to omit buildings without clear
                purposes or with irregular forms (<xref ref-type="bibr" rid="B39">Karlsmo and
                    L&#246;fgren 2016: 12</xref>).<xref ref-type="fn" rid="n1">1</xref> Also, when
                we look at transformations, there is always (as we shall see) a change both in form
                and use. The room type of the Swedish kitchen, for example, has changed in both form
                and use over the centuries. What it can be used for and by whom, as well as its
                form, location and integration in the house has changed many times, yet it has
                retained its identity as a kitchen. Types can also be described as
                &#8216;territorial sorts&#8217;, since they territorialize a certain object or space
                with a certain meaning/intensity (<xref ref-type="bibr" rid="B14">Brighenti
                    2010</xref>; <xref ref-type="bibr" rid="B40">K&#228;rrholm 2013</xref>). Types
                are not innocent, but are soaked in power. They are in fact a way of turning a
                certain space into a socio-material actor with a certain effect, i.e., into a
                territory. One could also describe them as &#8216;sorts&#8217; to make clear that
                they are not defined by a standard set of entities (like prototypes might be), but
                must be seen as a more fluid assemblage where no entity is in itself obligatory.
                Instead, different entities can come and go over time as long as they share some
                kind of family resemblance (<xref ref-type="bibr" rid="B53">Law and Mol
                1994</xref>).</p>
            <p>So, how do we approach the question of typological transformation? In 1825,
                Quatrem&#232;re de Quincy defined an idealistic concept of type: &#8216;an object
                after which each [artist] can conceive works of art that have no resemblance&#8217;
                    (<xref ref-type="bibr" rid="B80">Quatrem&#232;re de Quincy in Steadman 2014:
                    353</xref>) but instead have an elementary principle in common. Ever since then,
                type has often been used from a normative and prototypical perspective (<xref
                    ref-type="bibr" rid="B80">Steadman 2014: 354</xref>). In Aldo Rossi&#8217;s
                    <italic>L&#8217;architettura della citta</italic> (1966), for example,
                identifying recurrent types of buildings was a way to justify architectural form,
                because recurrent types ensured a certain meaning, producing a historical continuity
                within the city (<xref ref-type="bibr" rid="B31">Forty 2000: 304&#8211;11</xref>).
                Urban morphologists as well as urban and architectural historians have also used a
                more empirical notion of type, but nevertheless remarked on its form as a mental
                image. For example, Caniggia and Maffei argue that types can be defined <italic>a
                    posteriori</italic>, but they also claim that their existence actually depends
                on the fact that &#8216;it [the building type] exists in the builder&#8217;s mind
                before producing a house&#8217; (<xref ref-type="bibr" rid="B17">Caniggia and Maffei
                    2001: 53</xref>; see also <xref ref-type="bibr" rid="B49">Kropf
                2001</xref>).</p>
            <p>Types, or territorial sorts, are abstractions that enable us to think and do, but
                they should not be seen as ready-made solutions or an ordered list of rules.
                Territorial sorts are often too dependent on vague associations, atmospheres and
                affects to be formalized as some sort of mental model or a rule of thumb. As crime
                fiction has taught us, a gunshot in the dark might change one type of place into
                another, an idyllic village street into &#8216;a dangerous and scary place&#8217; or
                even into &#8216;a crime scene&#8217; in the blink of an eye. To name or categorize
                something as a specific type or sort of space is thus a quite basic phenomenon, and
                should not be confused with the much more specific case of typification that we see
                in modern and industrialized housing (where room types might be sorted into
                taxonomies, and where each type might be defined more formally through different
                kinds of regulations). Formalization is an exception rather than a rule when it
                comes to the effect of types. I would therefore like to suggest a much more fluid
                view on spatial types. They might of course hold a certain stability, but arriving
                at a definition is always a struggle, because all types are always on the way
                towards something new (<xref ref-type="bibr" rid="B41">K&#228;rrholm 2016</xref>).
                In short, when it comes to types, there is always continuity as well as continuous
                change in both form and use (<xref ref-type="bibr" rid="B43">Koch 2014</xref>).</p>
            <p>Typological transformations can be investigated through comprehensive historical and
                ethnographic studies (e.g. <xref ref-type="bibr" rid="B67">Paulsson 1950</xref>).
                Although I advocate studies of this kind, I also consider it necessary to address
                the question on a more abstract and general level. One way to do this is through a
                biological analogy (<xref ref-type="bibr" rid="B49">Kropf 2001</xref>; <xref
                    ref-type="bibr" rid="B79">Steadman 2008</xref>, <xref ref-type="bibr" rid="B80"
                    >2014</xref>). The analogy between typological transformation and Darwinian
                evolution was often taken to mean that types improved and became more complex and
                advanced (with a &#8216;better fit&#8217;) over time. This view was especially
                popular during the late 19th century (<xref ref-type="bibr" rid="B39">Karlsmo &amp;
                    L&#246;fgren 2016</xref>; <xref ref-type="bibr" rid="B87">Werne 1997</xref>),
                but can actually also be found in more recent building type theory (<xref
                    ref-type="bibr" rid="B75">Scheer 2010: 27</xref>). The theory of evolution does
                not, however, state that there is a pre-determined hierarchy of types (in terms of
                value), nor that types always develop from basic to more complex ones &#8212; both
                directions are always possible. The development of room types or building types
                seldom occurs through random variations (<xref ref-type="bibr" rid="B80">Steadman
                    2014: 3</xref>). Neither are such types provided by a certain environment or
                context in any deterministic sense.</p>
            <p>Nevertheless, a metaphor of spatial species, or more specifically, room species, is a
                first step towards a more animated and ecological discussion of types. Darwin
                himself was well aware of the problem of defining a species (<xref ref-type="bibr"
                    rid="B20">Darwin 2011: 44&#8211;50</xref>), and species are always, as Brighenti
                suggests, &#8216;both territories and movement&#8217; (<xref ref-type="bibr"
                    rid="B15">Brighenti 2014: 11</xref>). Species are constantly moving figures, and
                categorization is always a temporary abstraction. Evolution theory has shown us that
                we are machines of difference (cf. <xref ref-type="bibr" rid="B21">Deleuze
                    1994</xref>). Life is continually producing differences, and if selection
                (random or not) seems to temporarily stabilize a species, enabling an abstraction,
                the forces of deterritorialization are always working in its very midst. This
                process can, for example, be discussed in relation to the visitor centre type of
                building (<xref ref-type="bibr" rid="B41">K&#228;rrholm 2016</xref>). The
                establishment of different kinds of information and welcoming spaces relating to
                tourist attractions led to the development of the visitor centre as a new building
                type in Sweden during the early 1990s. However, only a decade or so later it seems
                as if different subtypes were formed, bearing the seeds of several new species of
                space. Theoretically, every individual difference always has the potential to be the
                start of a new species. Room types, involved and entangled as they are in our
                everyday lives, are no exception.</p>
        </sec>
        <sec>
            <title>The Study of Building Plans</title>
            <p>A large base of empirical material, preferably covering a long period, is necessary
                to study the evolution of room types. The empirical material for this article is
                based on the study of the plans of 2,340 buildings made in Sweden or drawn by
                Swedish architects from around 1750 until 2010. Of these, 816 buildings are
                residential types and 1,524 represent building types primarily built for other
                purposes (hospitals, schools, governmental buildings, railway stations, museums,
                etc.). The residential types were more important for this article, but residential
                room types in Sweden were also found in public buildings, factories, office
                buildings, etc., until at least the 1960s.<xref ref-type="fn" rid="n2">2</xref></p>
            <p>In the study, all of the different room types in each building plan were noted and
                sorted chronologically according to building type. The database consists of a total
                of approximately 40,000 to 45,000 rooms. The building plans were collected through
                an inventory of all issues of the Swedish magazine <italic>Arkitektur</italic> (the
                Swedish architectural review and the largest Nordic magazine about architecture),
                which began in 1901.<xref ref-type="fn" rid="n3">3</xref> To better account for the
                years before 1901, a number of reference works on important building types and
                architects was also used (see reference list). Information on room types between
                1750 and 1900 is also taken from the well-documented architectural history of
                residential buildings in Sweden (e.g., <xref ref-type="bibr" rid="B77">Selling
                    1937</xref>; <xref ref-type="bibr" rid="B58">Lundberg 1942</xref>; <xref
                    ref-type="bibr" rid="B27">Erixon 1947</xref>; <xref ref-type="bibr" rid="B32"
                    >Gejvall 1988</xref>; <xref ref-type="bibr" rid="B66">Nylander 2013</xref>).</p>
            <p>The homes of the middle and upper classes are well represented because these sources
                focus on buildings drawn by architects and published in architectural journals. Some
                room types might therefore also be omitted altogether, such as antiquated but
                enduring rural room types and room types common in poorer housing, like the
                    <italic>spisrum</italic> (literally, stove room), found in and around Stockholm
                in the second half of the 19th century. In single room apartments, the spisrum was a
                combined living room, bedroom and kitchen. Although this type was quite common, it
                does not appear on any of the plans I studied.</p>
            <p>The work also relies on terms found in the Swedish national dictionary,
                    <italic>Svensk Akademisk Ordbok</italic> (SAOB), an ongoing project that began
                in 1893, as well as in the shorter but complete and more updated <italic>Svensk
                    Ordbok</italic> (SO).<xref ref-type="fn" rid="n4">4</xref> While naming is of
                course an important part in the spread of spatial species (<xref ref-type="bibr"
                    rid="B80">Steadman 2014: 360</xref>), it should be remembered that these
                dictionaries are based on texts and not on plans, and actually account for words
                used for room types whether built as such or not.</p>
        </sec>
        <sec>
            <title>Themes in the Life and Death of Residential Room Types</title>
            <p>Rather than presented in a strictly chronological way, the findings are explored as a
                series of different themes. Tables <xref ref-type="table" rid="T1">1</xref> and
                    <xref ref-type="table" rid="T2">2</xref> provide background for the discussion,
                since they present the approximate lifespans and dates of origin of a number of room
                types. Room types often feature in everyday language long after they have ceased
                appearing in plans (during my own childhood in the 1970s and 80s, it was thus not
                unusual for older people to refer to a room in their apartment or villa as a maiden
                chamber, even though the room had not been used as such since the 1940s or
                &#8217;50s). A room type might also appear both as a concept and as an actual place
                before it receives a specific and deliberate design by an architect (cf. <xref
                    ref-type="bibr" rid="B80">Steadman 2014: 368</xref>).</p>
            <table-wrap id="T1">
                <label>Table 1</label>
                <caption>
                    <p>The years of first and last appearances of still-active residential room
                        types, based on the database developed by the author from architectural
                        plans dating between 1750 and 2010. The second column shows the first
                        appearance according to the Swedish national dictionaries
                            (<italic>SAOB</italic> and <italic>SO</italic>). The following two
                        columns show the first and last appearances according to the room type
                        database (on which this article is based). The final column shows the age of
                        each room type (in years), calculated as the difference in years between
                        2010 and its first appearance (marked in bold).</p>
                </caption>
                <table>
                    <tr>
                        <th align="left" valign="top"/>
                        <th align="center" valign="top">First appearance according to
                                <italic>SAOB/SO</italic></th>
                        <th align="center" valign="top">First and last appearance in residential
                            buildings</th>
                        <th align="center" valign="top">First and last appearance in
                            non&#8211;residential buildings</th>
                        <th align="center" valign="top">Years of age in 2010</th>
                    </tr>
                    <tr>
                        <td colspan="5">
                            <hr/>
                        </td>
                    </tr>
                    <tr>
                        <td align="left"><italic>Kl&#228;dkammare</italic> (Clothes chamber)</td>
                        <td align="right">
                            <bold>1425</bold>
                        </td>
                        <td align="right">1771&#8211;2010</td>
                        <td align="right">1920&#8211;1974</td>
                        <td align="right">585</td>
                    </tr>
                    <tr>
                        <td align="left"><italic>K&#246;k</italic> (Kitchen)</td>
                        <td align="right">
                            <bold>1538</bold>
                        </td>
                        <td align="right">1710&#8211;2010</td>
                        <td align="right">1758&#8211;2010</td>
                        <td align="right">472</td>
                    </tr>
                    <tr>
                        <td align="left"><italic>Bibliotek</italic> (Library)</td>
                        <td align="right">
                            <bold>1561</bold>
                        </td>
                        <td align="right">1727&#8211;2010</td>
                        <td align="right">1784&#8211;2010</td>
                        <td align="right">449</td>
                    </tr>
                    <tr>
                        <td align="left"><italic>Matsal</italic> (Dining room)</td>
                        <td align="right">
                            <bold>1583</bold>
                        </td>
                        <td align="right">1728&#8211;2009</td>
                        <td align="right">1777&#8211;2010</td>
                        <td align="right">427</td>
                    </tr>
                    <tr>
                        <td align="left"><italic>Tv&#228;ttstuga</italic> (Wash&#8211;house/laundry
                            room)</td>
                        <td align="right">
                            <bold>1640</bold>
                        </td>
                        <td align="right">1854&#8211;2008</td>
                        <td align="right">1861&#8211;1993</td>
                        <td align="right">370</td>
                    </tr>
                    <tr>
                        <td align="left"><italic>Bastu</italic> (Sauna)</td>
                        <td align="right">
                            <bold>1694</bold>
                        </td>
                        <td align="right">1841&#8211;2008</td>
                        <td align="right">1820&#8211;2010</td>
                        <td align="right">316</td>
                    </tr>
                    <tr>
                        <td align="left"><italic>Garderob</italic> (Wardrobe)</td>
                        <td align="right">1729</td>
                        <td align="right"><bold>1728</bold>&#8211;1983</td>
                        <td align="right">1784&#8211;2010</td>
                        <td align="right">282</td>
                    </tr>
                    <tr>
                        <td align="left"><italic>Vardagsrum</italic> (Living room)</td>
                        <td align="right">
                            <bold>1750</bold>
                        </td>
                        <td align="right">1844&#8211;2010</td>
                        <td align="right">1920&#8211;2007</td>
                        <td align="right">260</td>
                    </tr>
                    <tr>
                        <td align="left"><italic>Salong</italic> (Salon)</td>
                        <td align="right">1787</td>
                        <td align="right"><bold>1756</bold>&#8211;2005</td>
                        <td align="right">1801&#8211;2010</td>
                        <td align="right">254</td>
                    </tr>
                    <tr>
                        <td align="left"><italic>Badrum</italic> (Bathroom)</td>
                        <td align="right">
                            <bold>1763</bold>
                        </td>
                        <td align="right">1860&#8211;2010</td>
                        <td align="right">1860&#8211;2010</td>
                        <td align="right">247</td>
                    </tr>
                    <tr>
                        <td align="left"><italic>Biljardrum</italic> (Billiard room)</td>
                        <td align="right">1818</td>
                        <td align="right"><bold>1773</bold>&#8211;1992</td>
                        <td align="right">1902&#8211;1993</td>
                        <td align="right">237</td>
                    </tr>
                    <tr>
                        <td align="left"><italic>Sovrum</italic> (Bedroom)</td>
                        <td align="right">
                            <bold>1783</bold>
                        </td>
                        <td align="right">1869&#8211;2010</td>
                        <td align="right">1870&#8211;2006</td>
                        <td align="right">227</td>
                    </tr>
                    <tr>
                        <td align="left"><italic>Arbetsrum</italic> (Study)</td>
                        <td align="right">1795</td>
                        <td align="right"><bold>1790</bold>&#8211;2006</td>
                        <td align="right">1845&#8211;2009</td>
                        <td align="right">220</td>
                    </tr>
                    <tr>
                        <td align="left"><italic>Kapprum</italic> (Cloakroom)</td>
                        <td align="right">
                            <bold>1842</bold>
                        </td>
                        <td align="right">1900&#8211;2010</td>
                        <td align="right">1840&#8211;2010</td>
                        <td align="right">168</td>
                    </tr>
                    <tr>
                        <td align="left"><italic>Lekrum</italic> (Playroom)</td>
                        <td align="right">
                            <bold>1843</bold>
                        </td>
                        <td align="right">1918&#8211;2005</td>
                        <td align="right">1932&#8211;2010</td>
                        <td align="right">167</td>
                    </tr>
                    <tr>
                        <td align="left"><italic>WC</italic> (Water closet)</td>
                        <td align="right">1887</td>
                        <td align="right"><bold>1872</bold>&#8211;2010</td>
                        <td align="right">1858&#8211;2010</td>
                        <td align="right">138</td>
                    </tr>
                    <tr>
                        <td align="left"><italic>Hall</italic> (Hall/Hallway)</td>
                        <td align="right">1899</td>
                        <td align="right"><bold>1877</bold>&#8211;2010</td>
                        <td align="right">1902&#8211;2010</td>
                        <td align="right">133</td>
                    </tr>
                    <tr>
                        <td align="left"><italic>Skyddsrum</italic> (Shelter)</td>
                        <td align="right">
                            <bold>1880</bold>
                        </td>
                        <td align="right">1942&#8211;1963</td>
                        <td align="right">1932&#8211;1999</td>
                        <td align="right">130</td>
                    </tr>
                    <tr>
                        <td align="left"><italic>Garage</italic> (Garage)</td>
                        <td align="right">
                            <bold>1907</bold>
                        </td>
                        <td align="right">1916&#8211;2010</td>
                        <td align="right">1912&#8211;2010</td>
                        <td align="right">103</td>
                    </tr>
                    <tr>
                        <td align="left"><italic>Pentry</italic> (Kitchenette/Galley)</td>
                        <td align="right">
                            <bold>1907</bold>
                        </td>
                        <td align="right">1939&#8211;2010</td>
                        <td align="right">1920&#8211;2010</td>
                        <td align="right">103</td>
                    </tr>
                    <tr>
                        <td align="left"><italic>Kokvr&#229;</italic> (Kitchenette)</td>
                        <td align="right">
                            <bold>1915</bold>
                        </td>
                        <td align="right">1920&#8211;1992</td>
                        <td align="right">1928&#8211;1974</td>
                        <td align="right">95</td>
                    </tr>
                    <tr>
                        <td align="left"><italic>Grovk&#246;k</italic> (Scullery)</td>
                        <td align="right">1965</td>
                        <td align="right"><bold>1943</bold>&#8211;2003</td>
                        <td align="right">&#8211;</td>
                        <td align="right">67</td>
                    </tr>
                    <tr>
                        <td align="left"><italic>TV-rum</italic> (TV room)</td>
                        <td align="right">
                            <bold>1950</bold>
                        </td>
                        <td align="right">1962&#8211;2010</td>
                        <td align="right">1961&#8211;1971</td>
                        <td align="right">60</td>
                    </tr>
                    <tr>
                        <td align="left"><italic>Allrum</italic> (Family room)</td>
                        <td align="right">1955</td>
                        <td align="right"><bold>1953</bold>&#8211;2010</td>
                        <td align="right">1969&#8211;2010</td>
                        <td align="right">57</td>
                    </tr>
                </table>
            </table-wrap>
            <table-wrap id="T2">
                <label>Table 2</label>
                <caption>
                    <p>Lifespan of short-lived or unusual residential room types, based on the
                        database developed by the author from architectural plans dating between
                        1750 and 2010. The second column shows the first appearance according to the
                        Swedish national dictionaries (<italic>SAOB</italic> and
                        <italic>SO</italic>). The following two columns show the first and last
                        appearances according to the room type database (that this article is based
                        on). The final column shows the total number of years since the room
                        type&#8217;s last appearance in a residential building (in 2010).</p>
                </caption>
                <table>
                    <tr>
                        <th align="left" valign="top"/>
                        <th align="center" valign="top">First appearance according to
                                <italic>SAOB/SO</italic></th>
                        <th align="center" valign="top">First and last appearance in residential
                            buildings</th>
                        <th align="center" valign="top">First and last appearance in
                            non&#8211;residential buildings</th>
                        <th align="center" valign="top">Years since last appearance
                            (residential)</th>
                    </tr>
                    <tr>
                        <td colspan="5">
                            <hr/>
                        </td>
                    </tr>
                    <tr>
                        <td align="left"><italic>Skafferi</italic> (Pantry)</td>
                        <td align="right">1547</td>
                        <td align="right">1754&#8211;1994</td>
                        <td align="right">1749&#8211;1954</td>
                        <td align="right">16</td>
                    </tr>
                    <tr>
                        <td align="left"><italic>Hobbyrum</italic> (Hobby room)</td>
                        <td align="right">&#8211;</td>
                        <td align="right">1949&#8211;1989</td>
                        <td align="right">1954&#8211;2010</td>
                        <td align="right">21</td>
                    </tr>
                    <tr>
                        <td align="left"><italic>S&#228;ngkammare</italic> (Bedchamber)</td>
                        <td align="right">1469</td>
                        <td align="right">1710&#8211;1985</td>
                        <td align="right">1758&#8211;1965</td>
                        <td align="right">25</td>
                    </tr>
                    <tr>
                        <td align="left"><italic>V&#228;vkammare</italic> (Weaving chamber)</td>
                        <td align="right">&#8211;</td>
                        <td align="right">1915&#8211;1985</td>
                        <td align="right">1925&#8211;1993</td>
                        <td align="right">25</td>
                    </tr>
                    <tr>
                        <td align="left"><italic>Syrum</italic> (Sewing room)</td>
                        <td align="right">1872</td>
                        <td align="right">1914&#8211;1985</td>
                        <td align="right">1925&#8211;1994</td>
                        <td align="right">25</td>
                    </tr>
                    <tr>
                        <td align="left"><italic>Finrum</italic> (The &#8216;nice&#8217;
                            room/Parlour)</td>
                        <td align="right">1942</td>
                        <td align="right">1943&#8211;1984</td>
                        <td align="right">1999</td>
                        <td align="right">26</td>
                    </tr>
                    <tr>
                        <td align="left">
                            <italic>Dressing room</italic>
                        </td>
                        <td align="right">&#8211;</td>
                        <td align="right">1941&#8211;1982</td>
                        <td align="right">1999</td>
                        <td align="right">28</td>
                    </tr>
                    <tr>
                        <td align="left"><italic>R&#246;krum</italic> (Smoking room)</td>
                        <td align="right">1807</td>
                        <td align="right">1816&#8211;1980</td>
                        <td align="right">1801&#8211;1991</td>
                        <td align="right">30</td>
                    </tr>
                    <tr>
                        <td align="left"><italic>Gillestuga</italic> (Room for parties)</td>
                        <td align="right">1950</td>
                        <td align="right">1963&#8211;1979</td>
                        <td align="right">1955&#8211;1977</td>
                        <td align="right">31</td>
                    </tr>
                    <tr>
                        <td align="left"><italic>Blomrum</italic> (Flower room)</td>
                        <td align="right">1883</td>
                        <td align="right">1867&#8211;1973</td>
                        <td align="right">&#8211;</td>
                        <td align="right">37</td>
                    </tr>
                    <tr>
                        <td align="left"><italic>Sal</italic> (Grand salle/Great room)</td>
                        <td align="right">1526</td>
                        <td align="right">1721&#8211;1972</td>
                        <td align="right">1758&#8211;1977</td>
                        <td align="right">38</td>
                    </tr>
                    <tr>
                        <td align="left"><italic>Tambur</italic> (Lobby or antechamber)</td>
                        <td align="right">1799</td>
                        <td align="right">1778&#8211;1971</td>
                        <td align="right">1801&#8211;1954</td>
                        <td align="right">39</td>
                    </tr>
                    <tr>
                        <td align="left"><italic>F&#246;rmak</italic> (Drawing room and/or
                            antechamber)</td>
                        <td align="right">1585</td>
                        <td align="right">1728&#8211;1965</td>
                        <td align="right">1777&#8211;1965</td>
                        <td align="right">45</td>
                    </tr>
                    <tr>
                        <td align="left"><italic>Serveringsrum</italic> (Serving room)</td>
                        <td align="right">1865</td>
                        <td align="right">1848&#8211;1964</td>
                        <td align="right">1845&#8211;2006</td>
                        <td align="right">46</td>
                    </tr>
                    <tr>
                        <td align="left"><italic>Vestibul</italic> (Vestibule)</td>
                        <td align="right">1713</td>
                        <td align="right">1750&#8211;1962</td>
                        <td align="right">1851&#8211;2005</td>
                        <td align="right">48</td>
                    </tr>
                    <tr>
                        <td align="left"><italic>Hembitr&#228;desrum</italic> (Housemaid&#8217;s
                            chamber)</td>
                        <td align="right">1919</td>
                        <td align="right">1931&#8211;1961</td>
                        <td align="right">&#8211;</td>
                        <td align="right">49</td>
                    </tr>
                    <tr>
                        <td align="left"><italic>Fruns rum</italic> (Wife&#8217;s room)</td>
                        <td align="right">&#8211;</td>
                        <td align="right">1851&#8211;1957</td>
                        <td align="right">1902&#8211;1920</td>
                        <td align="right">53</td>
                    </tr>
                    <tr>
                        <td align="left"><italic>Linnerum</italic> (Linen room)</td>
                        <td align="right">&#8211;</td>
                        <td align="right">1874&#8211;1953</td>
                        <td align="right">1902&#8211;1983</td>
                        <td align="right">57</td>
                    </tr>
                    <tr>
                        <td align="left"><italic>F&#246;rstuga/farstu</italic> (Entryway)</td>
                        <td align="right">1410</td>
                        <td align="right">1686&#8211;1949</td>
                        <td align="right">1749&#8211;1944</td>
                        <td align="right">61</td>
                    </tr>
                    <tr>
                        <td align="left"><italic>Pojkrum/flickrum</italic> (Boy&#8217;s
                            room/Girl&#8217;s room)</td>
                        <td align="right">1936</td>
                        <td align="right">1919&#8211;1949</td>
                        <td align="right">&#8211;</td>
                        <td align="right">61</td>
                    </tr>
                    <tr>
                        <td align="left"><italic>Handkammare</italic> (Pantry)</td>
                        <td align="right">1824</td>
                        <td align="right">1815&#8211;1949</td>
                        <td align="right">1900&#8211;1949</td>
                        <td align="right">61</td>
                    </tr>
                    <tr>
                        <td align="left"><italic>Barnkammare</italic> (Children&#8217;s
                            chamber)</td>
                        <td align="right">1655</td>
                        <td align="right">1746&#8211;1949</td>
                        <td align="right">1782&#8211;1947</td>
                        <td align="right">61</td>
                    </tr>
                    <tr>
                        <td align="left"><italic>Jungfrukammare</italic> (Maid&#8217;s chamber)</td>
                        <td align="right">1791</td>
                        <td align="right">1746&#8211;1949</td>
                        <td align="right">1784&#8211;1943</td>
                        <td align="right">61</td>
                    </tr>
                    <tr>
                        <td align="left"><italic>Borstrum</italic> (Brushing room)</td>
                        <td align="right">1915</td>
                        <td align="right">1880&#8211;1946</td>
                        <td align="right">1930&#8211;1961</td>
                        <td align="right">64</td>
                    </tr>
                    <tr>
                        <td align="left"><italic>Herrum</italic> (Gentleman&#8217;s room)</td>
                        <td align="right">1884</td>
                        <td align="right">1848&#8211;1946</td>
                        <td align="right">1900&#8211;1928</td>
                        <td align="right">64</td>
                    </tr>
                    <tr>
                        <td align="left"><italic>Boudoir</italic> (Boudoir)</td>
                        <td align="right">1811</td>
                        <td align="right">1750&#8211;1944</td>
                        <td align="right">&#8211;</td>
                        <td align="right">66</td>
                    </tr>
                    <tr>
                        <td align="left"><italic>Skrivrum</italic> (Writing room)</td>
                        <td align="right">1840</td>
                        <td align="right">1832&#8211;1943</td>
                        <td align="right">1876&#8211;1988</td>
                        <td align="right">67</td>
                    </tr>
                    <tr>
                        <td align="left"><italic>Domestikrum</italic> (Servant&#8217;s room)</td>
                        <td align="right">1791</td>
                        <td align="right">1768&#8211;1925</td>
                        <td align="right">1867</td>
                        <td align="right">85</td>
                    </tr>
                    <tr>
                        <td align="left"><italic>Kabinett</italic> (Cabinet room)</td>
                        <td align="right">1646</td>
                        <td align="right">1737&#8211;1923</td>
                        <td align="right">1784&#8211;1964</td>
                        <td align="right">87</td>
                    </tr>
                    <tr>
                        <td align="left"><italic>Pigkammare</italic> (Maid&#8217;s chamber)</td>
                        <td align="right">1595</td>
                        <td align="right">1721&#8211;1916</td>
                        <td align="right">1777&#8211;1870</td>
                        <td align="right">94</td>
                    </tr>
                    <tr>
                        <td align="left"><italic>Divanrum</italic> (Divan room)</td>
                        <td align="right">1795</td>
                        <td align="right">1787&#8211;1881</td>
                        <td align="right">1884</td>
                        <td align="right">129</td>
                    </tr>
                    <tr>
                        <td align="left"><italic>Sk&#228;nkrum</italic> (Cupboard room)</td>
                        <td align="right">1740</td>
                        <td align="right">1775&#8211;1874</td>
                        <td align="right">1900&#8211;1957</td>
                        <td align="right">136</td>
                    </tr>
                </table>
            </table-wrap>
            <sec>
                <title>Thresholds of Birth and Extinction</title>
                <p>In the plans for the large Swedish houses of the 17th and early 18th centuries,
                    rooms were often classified according to size, and not always according to
                    function (<xref ref-type="bibr" rid="B32">Gejvall 1988: 171</xref>; cf. <xref
                        ref-type="bibr" rid="B73">Rybczynski 1986: 42</xref>). Houses included
                        <italic>kammare</italic> (small chambers) and <italic>kabinett</italic>
                    (cabinets), and <italic>salar</italic> (larger rooms) and
                        <italic>salonger</italic> (salons), and the interior arrangement of these
                    rooms was often important. Larger bedrooms could, for example, have both
                    antechambers and smaller back rooms to which inhabitants could withdraw (Figure
                        <xref ref-type="fig" rid="F1">1</xref>). The sequence of movement and the
                    notion of hosting guests was thus an important matter in these plans (cf. <xref
                        ref-type="bibr" rid="B4">Baeckstr&#246;m, 1917: 46</xref>).</p>
                <fig id="F1">
                    <label>Figure 1</label>
                    <caption>
                        <p>J.G. Destain&#8217;s plan of Bj&#246;rksund from the 1720s (<xref
                                ref-type="bibr" rid="B77">Selling 1937: 47</xref>). Here the room
                            types are still quite generic, relating to the size or position of the
                            rooms rather than to their use, like antechamber
                                (<italic>f&#246;rmak</italic>), chamber (<italic>kammare</italic>)
                            and cabinet (<italic>kabinet</italic>).</p>
                    </caption>
                    <graphic xmlns:xlink="http://www.w3.org/1999/xlink"
                        xlink:href="/article/id/7592/file/110150/"/>
                </fig>
                <p>The chambers and cabinets, however, soon grew more specific &#8212; porcelain
                    chambers, milk chambers, writing chambers, guest chambers, etc. &#8212; while
                    the more general types of chambers and cabinets gradually disappeared. The early
                    Swedish texts on architecture, such as those by Johan Eberhard Carlberg (1740),
                    Carl Wijnblad (1755&#8211;56) and Carl St&#229;l (1834), were all greatly
                    influenced by French architecture, and Swedish residential plans often followed
                    the French style of organizing prominent houses, with an
                        <italic>enfilade</italic> of predominantly large rooms towards the front of
                    the building, combined with two sets of rooms (antechamber, bedroom, cabinet and
                    wardrobe), one for the husband and one for the wife (Figure <xref ref-type="fig"
                        rid="F2">2</xref>). These were principles that French architects such as
                    Augustin-Charles d&#8217;Aviler, Charles-&#201;tienne Briseux and
                    Jacques-Fran&#231;ois Blondel introduced during the 17th and 18th centuries. An
                    interesting Swedish example can, for example, be found in Baron F.
                    L&#246;wen&#8217;s house in Stockholm, from the 1740s (<xref ref-type="bibr"
                        rid="B32">Gejvall 1988: 105f</xref>).</p>
                <fig id="F2">
                    <label>Figure 2</label>
                    <caption>
                        <p>E. Palmstedt&#8217;s plan of Skinnskatteberg from 1770s (from <xref
                                ref-type="bibr" rid="B77">Selling 1937: 324</xref>). The
                            wife&#8217;s quarters are on right side at the the back, whereas the
                            husband&#8217;s quarters are on the left side at the front. The kitchen
                                (<italic>kj</italic>&#246;k), maid&#8217;s chamber
                                (<italic>jungfrukamare</italic>) and a chamber for porcelain
                                (<italic>porcelainer</italic>) are at the back left side. The dining
                            room (<italic>matsal</italic>) is connected to the entrance
                                (<italic>f&#246;rstufva</italic>), and the great room
                                (<italic>sal</italic>) is connected to the main stairs on the second
                            floor.</p>
                    </caption>
                    <graphic xmlns:xlink="http://www.w3.org/1999/xlink"
                        xlink:href="/article/id/7592/file/110151/"/>
                </fig>
                <p>The earlier Swedish houses and apartments, influenced by French architecture,
                    could thus be seen as divided into two parts (<xref ref-type="bibr" rid="B32"
                        >Gejvall 1988: 255</xref>). One part contained social rooms and living
                    quarters, with a large room &#8212; the <italic>sal</italic> &#8212; in the
                    middle, and with one series of rooms on the husband&#8217;s side and one on the
                    wife&#8217;s side. These two different suites of living quarters often included
                    a <italic>f&#246;rmak</italic> (antechamber), a bedroom and a cabinet. The other
                    part of the house contained the kitchen area with servants&#8217; rooms and
                    possibly children&#8217;s chambers.</p>
                <p>The great room, or <italic>sal</italic> (quite similar in use and style to the
                    French <italic>salle</italic>; <xref ref-type="bibr" rid="B73">Rybczynski 1986:
                        38</xref>) was an important Swedish room type that acted as a living room, a
                    dining room, and a room for work as well as for parties and for hosting guests.
                    It was also an important room for movement, as many apartments actually required
                    all visitors and family members to pass through the <italic>sal</italic> to
                    reach the other rooms of the apartment (<xref ref-type="bibr" rid="B32">Gejvall
                        1988: 188&#8211;200</xref>). The room type <italic>tambur</italic>, a kind
                    of lobby or antechamber, was introduced in Stockholm apartments at the end of
                    the 18th century, and came to act as a kind of small entrance room to the
                        <italic>sal</italic>. It was often used to hang clothes and store wood for
                    the fireplaces. Later it became an important connector to other rooms as well,
                    and as such was well integrated in the spaces of the home. The idea of an
                    antechamber to main rooms was a French idea, but the role that the
                        <italic>tambur</italic> soon took on was probably more influenced by the way
                    that the <italic>Vorzimmer</italic> was used in German apartments during the
                    19th century (see <xref ref-type="bibr" rid="B32">Gejvall 1988:
                        175&#8211;86</xref> for a more thorough discussion on the
                        <italic>tambur</italic>).</p>
                <p>The importance of the <italic>tambur</italic> increased, and it become larger and
                    lighter, growing into a kind of lobby during the second half of the 19th century
                    (Figure <xref ref-type="fig" rid="F3">3</xref>). The <italic>tambur</italic>
                    also came to be physically connected to such increasingly popular types as
                    serving rooms and linen rooms, as well as to corridors and passages, and as such
                    it became key to enabling movement through the dwelling without passage through
                    the more presentable, formal rooms (<xref ref-type="bibr" rid="B32">Gejvall
                        1988: 107f</xref>). The role of the <italic>tambur</italic> thus changed.
                    It, together with the <italic>sal</italic>, takes on a less presentable and more
                    functional role, becoming a passage, while the <italic>sal</italic> often is
                    reduced to the function of dining room (<italic>mat-sal</italic>).</p>
                <fig id="F3">
                    <label>Figure 3</label>
                    <caption>
                        <p>Two Stockholm flats, drawn by A. Johansson in 1894&#8211;96 (<xref
                                ref-type="bibr" rid="B82"><italic>Teknisk tidskrift, Afd. f&#246;r
                                    byggnadskonst</italic>, 1897: pl. 13</xref>). The
                                <italic>tambur</italic> to the left follows an older tradition where
                            movement through more representational spaces becomes obligatory. The
                                <italic>tambur</italic> to the right is connected to a set of
                            passages and secondary spaces. Here we can also see a division of the
                            apartment into four different areas, as described above.</p>
                    </caption>
                    <graphic xmlns:xlink="http://www.w3.org/1999/xlink"
                        xlink:href="/article/id/7592/file/110152/"/>
                </fig>
                <p>Instead of the <italic>sal</italic>, which became less central over time, the
                    main formal rooms now became the <italic>salong</italic> and the
                        <italic>f&#246;rmak</italic>. The spatial organization of the late
                    19th-century Swedish apartment, inspired by the continental apartment in
                    countries such as France, and interestingly also Germany, can, according to
                    Gejvall (<xref ref-type="bibr" rid="B32">1988: 255</xref>), be described as
                    divided into four areas (Figure <xref ref-type="fig" rid="F3">3</xref>):</p>
                <list list-type="order">
                    <list-item>
                        <p>Reception area with the drawing rooms, antechambers and salon
                                (<italic>f&#246;rmak</italic> and <italic>salong</italic>).</p>
                    </list-item>
                    <list-item>
                        <p>Dining room (<italic>sal</italic> or <italic>matsal</italic>).</p>
                    </list-item>
                    <list-item>
                        <p>Living and bedroom areas. These sometimes included a small living room
                            for the family. Especially in winter, the bedrooms were also important
                            living areas, especially for the woman of the house, who might use the
                            bedroom for receiving female guests, writing, and sewing (<xref
                                ref-type="bibr" rid="B67">Paulsson 1950: 121</xref>; <xref
                                ref-type="bibr" rid="B32">Gejvall 1988: 234ff</xref>).</p>
                    </list-item>
                    <list-item>
                        <p>Kitchen area with servants&#8217; rooms. The difference between serving
                            spaces and served spaces became more important, as did the effort to
                            keep the sounds and smells of the kitchen and servant&#8217;s quarters
                            away from the salons and drawing rooms (<xref ref-type="bibr" rid="B58"
                                >Lundberg 1942 247</xref>). The distance between these rooms thus
                            tended to be extended during the second half of the 19th century (<xref
                                ref-type="bibr" rid="B32">Gejvall 1988: 199</xref>).</p>
                    </list-item>
                </list>
                <p>From the 1890s onwards, the English influence grew stronger, and the hall started
                    to become a more important and more dominant room (<xref ref-type="bibr"
                        rid="B58">Lundberg 1942: 257</xref>; <xref ref-type="bibr" rid="B32">Gejvall
                        1988: 168ff</xref>; <xref ref-type="bibr" rid="B67">Paulsson 1950:
                        120</xref>). The hall plan became popular in the new middle and upper-class
                    villas of the late 19th century, where rooms were arranged around the hall,
                    rather than in line. Soon, the <italic>tambur</italic> was exchanged for a hall
                    and a cloakroom. The cloakroom allowed the hall to be free from clothes and
                    other paraphernalia that often had cluttered the <italic>tambur</italic> (Figure
                        <xref ref-type="fig" rid="F4">4</xref>). The hall, which was more of a room
                    to dwell in than the <italic>tambur</italic>, also opened up for the spatial
                    connection to even more rooms (of different types), such as the
                        <italic>vardagsrum</italic> (approximately equivalent to living room, but
                    literally meaning &#8216;every-day room&#8217;).<xref ref-type="fn" rid="n5"
                        >5</xref></p>
                <fig id="F4">
                    <label>Figure 4</label>
                    <caption>
                        <p>Example of a hall plan, with rooms arranged around a hall, and a separate
                                <italic>kapprum</italic> (cloakroom). The house of W. B&#246;ker,
                            drawn by E. Lallerstedt (<italic>Arkitektur</italic> 1911: vol. 9, p.
                            123).</p>
                    </caption>
                    <graphic xmlns:xlink="http://www.w3.org/1999/xlink"
                        xlink:href="/article/id/7592/file/110153/"/>
                </fig>
                <p>At this time, there was also a critique of the
                        <italic>salong/f&#246;rmak</italic> (<xref ref-type="bibr" rid="B32">Gejvall
                        1988: 224</xref>) and the idea that hosting visitors seemed to be more
                    important than the living conditions and comforts of the inhabitants. Perhaps
                    this was one of the reasons why the centrally integrated hall, the cloakroom and
                    the <italic>vardagsrum</italic> became popular, whereas the
                        <italic>salong</italic> and the <italic>f&#246;rmak</italic> slowly
                    disappeared (Figure <xref ref-type="fig" rid="F5">5</xref>). In Sweden, the
                    number of residential room types also seems to peak around 1910 with Isak Gustaf
                    Clason&#8217;s houses. Clason designed a series of large houses during the
                    decades around the year 1900 (the last of the large Swedish estates of the
                    19th-century tradition), still following the Victorian tradition and its
                    plenitude of room types (<xref ref-type="bibr" rid="B24">Edestrand and Lundberg
                        1968: 48&#8211;62</xref>). After the 1920s, the number of room types seems
                    to decrease, and during the 1950s several of the former important types were
                    gone altogether (Figure <xref ref-type="fig" rid="F6">6</xref>). In
                    non-residential building types, the proliferation of more and more specific room
                    types went on longer, until the 1950s. One example is the hospital Sahlgrenska,
                    in Gothenburg, which had about 170 different room types. Perhaps it was only
                    with structuralism, and the call for flexibility during the 1960s (<xref
                        ref-type="bibr" rid="B31">Forty 2000</xref>), that the decrease in room
                    types became a general trend.</p>
                <fig id="F5">
                    <label>Figure 5</label>
                    <caption>
                        <p>The death of the salon (<italic>salong</italic>) and the
                            antechamber/drawing room (<italic>f&#246;rmak</italic>) and the rise of
                            the living room (<italic>vardagsrum</italic>) and the family room
                                (<italic>allrum</italic>), showing the percentage of residential
                            plans with a specific room type, 1890&#8211;1990 (number given for the
                            decade: 1890 comprises 1881&#8211;90, etc.). Diagram by Mattias
                            K&#228;rrholm.</p>
                    </caption>
                    <graphic xmlns:xlink="http://www.w3.org/1999/xlink"
                        xlink:href="/article/id/7592/file/110154/"/>
                </fig>
                <fig id="F6">
                    <label>Figure 6</label>
                    <caption>
                        <p>The percentage of residential plans with the room types of
                                <italic>herrum</italic> (gentleman&#8217;s room),
                                <italic>jungfrukammare</italic> (maid&#8217;s chamber),
                                <italic>tambur</italic> (antechamber),
                                <italic>serveringsrum</italic> (serving room),
                                <italic>borstrum</italic> (brush room), <italic>hobbyrum</italic>
                            (hobby room) and <italic>bastu</italic> (sauna), 1920&#8211;2010.
                            Diagram by Mattias K&#228;rrholm.</p>
                    </caption>
                    <graphic xmlns:xlink="http://www.w3.org/1999/xlink"
                        xlink:href="/article/id/7592/file/110155/"/>
                </fig>
                <p>As the functional differentiation of the home increased during the 19th century,
                    so did different kinds of power asymmetries. Moving the living quarters of
                    servants, as well as kitchens, bathrooms, etc., into the home also played a part
                    in the co-production of distances and asymmetries within the home itself. Social
                    distinctions were important and thus came to take an architectural form (<xref
                        ref-type="bibr" rid="B73">Rybczynski 1986: 49</xref>), where servants&#8217;
                    rooms were named according to the title or category of the servant. The built-in
                    asymmetries at the room type level seem to decrease as servants moved out and as
                    the number of room types declined in the mid-20th century.</p>
                <p>In summary, residential room types proliferated, first through the French idea of
                    different suites of rooms, then on through the continental apartment plan and
                    the English hall model; all three different models made it possible for the
                    number of room types to increase. The first wave of extinction started slowly
                    during the 1910s and &#8217;20s, with the fall of the representative room types.
                    A second wave of extinction was around the Second World War. The linen rooms,
                    brushing room, maid&#8217;s chambers, and gentleman&#8217;s rooms<xref
                        ref-type="fn" rid="n6">6</xref> all disappeared during the 1940s; the
                        <italic>tambur</italic> and the serving room declined quickly at the same
                    time but endured for a few more decades before disappearing altogether. The
                        <italic>tambur</italic>, which perhaps was the first catalyst for this rich
                    tradition of different room types, was thus the last to go. Following this
                    history, we can observe that spatial species do not always come and go one at a
                    time. Instead, it seems that there are quite often thresholds where series of
                    new spaces evolve or die. This has been made clear in studies of building types
                    that show, for example, that industrial society came with a series of new
                    building types concerned with production (<xref ref-type="bibr" rid="B60">Markus
                        1993</xref>), but these thresholds seem less studied when it comes to room
                    types. This change of the mid-20th-century residential spaces was perhaps most
                    of all about fewer people and more things (<xref ref-type="bibr" rid="B88"
                        >Westerberg and Eriksson 1998: 268</xref>); as a welfare society developed
                    and the home became a place for the family to host things rather than people,
                    room types connected to an older kind of society started to decline.</p>
            </sec>
            <sec>
                <title>Abruptive Room Types</title>
                <p>Not all room types come and go in groups. Indeed, a type might also arise from a
                    sudden, abrupt or disruptive invention, a &#8216;chronic&#8217; moment (<xref
                        ref-type="bibr" rid="B16">Brighenti and K&#228;rrholm 2019</xref>) of
                    upheaval and change. Here, I will just briefly mention two examples of room
                    types where this more subversive aspect (breaking with former tradition), is
                    stronger: namely the divan room and the <italic>allrum</italic> (family room, or
                    literally, &#8216;everything room&#8217;).</p>
                <p>The divan as a piece of Ottoman furniture was popular in Europe from the last
                    decades of the 18th century and into the first half of the 19th century. Sweden
                    had good diplomatic connections with Turkey during the 18th century (<xref
                        ref-type="bibr" rid="B3">Avcioglu 2011: 255ff</xref>), and King Gustav III
                    made several divan rooms in his palace at Haga (for example, in the pavilion
                    drawn by Olof Tempelman in 1787). The divan thus migrated into Swedish
                    architectural culture and got its very own room. In fact, in Swedish, divan did
                    not refer to the furniture at that time; in a Swedish dictionary from 1853, a
                    divan is defined as a room with low sofas along the wall (<xref ref-type="bibr"
                        rid="B32">Gejvall 1988: 241f</xref>). Most often the divan room was a bit
                    smaller than the salon and could be found in large private apartments or houses,
                    like at Stora Bjurum, where a divan room was introduced in 1869 (Figure <xref
                        ref-type="fig" rid="F7">7</xref>). In at least one case, however, the divan
                    room was also used in a public building. In Helgo Zettervall&#8217;s first plans
                    for Sweden&#8217;s Parliament House and Central Bank building in 1884, he placed
                    a large divan room very centrally and in direct relation to the foyer (<xref
                        ref-type="bibr" rid="B12">Bodin 2017: 815</xref>). This room disappeared in
                    later plans for the building, and to my knowledge it has not appeared on any
                    Swedish plans since then. As a room type, the divan room has no clear (Swedish)
                    predecessor, and it disappeared almost as quickly as it appeared.</p>
                <fig id="F7">
                    <label>Figure 7</label>
                    <caption>
                        <p>A divan room was introduced (next to the stairs) by Helgo Zettervall
                            during the restoration of Stora Bjurum in this plan from 1869 (ArkDes
                            digital archive, ARKM.1987-16-01, at <ext-link ext-link-type="uri"
                                xmlns:xlink="http://www.w3.org/1999/xlink"
                                xlink:href="https://digitaltmuseum.se/011024922176/ritning"
                                >https://digitaltmuseum.se/011024922176/ritning</ext-link>).</p>
                    </caption>
                    <graphic xmlns:xlink="http://www.w3.org/1999/xlink"
                        xlink:href="/article/id/7592/file/110156/"/>
                </fig>
                <p>The second example of abrupt inventions is the <italic>allrum</italic>. Although
                    the <italic>vardagsrum</italic> had replaced the salon during the early part of
                    the 20th century, it appears as if this room also became used for more formal
                    events and the reception of guests, and thus the struggle of architects and
                    politicians to establish a room for everyday use continued. The importance of a
                    space used for display and hosting guests, for example, often meant that
                    sleeping facilities were less prioritized, and this was perceived as a societal
                    problem (cf. <xref ref-type="bibr" rid="B67">Paulsson 1950: 120</xref>; <xref
                        ref-type="bibr" rid="B68">Perers et al. 2013</xref>). One important attempt
                    to change this was the <italic>allrum</italic> (literally, &#8216;everything
                    room&#8217;), a new room type that was introduced in the housing competition of
                    Baronbackarna in &#214;rebro 1950 (built 1953&#8211;57). The housing competition
                    was not aimed at inventing a new room type, but the winning proposal, announced
                    in 1951 (and designed by P.A. Ekholm and S. White), suggested that the
                    traditional living room could act as a kind of study room or studio
                        (<italic>arbetsrum</italic>). On later drawings this room was referred to as
                    an <italic>allrum</italic>. An experimental apartment with the very first
                        <italic>allrum</italic> was built during the summer of 1952, and furnished
                    with a kitchen sofa, a dinner table, a bookshelf and a desk with a sewing
                    machine (<xref ref-type="bibr" rid="B46">Krantz 1987: 96ff</xref>; see also
                        <xref ref-type="bibr" rid="B59">Mack 2017: 228ff</xref>). The new room type
                    received a lot of attention among architects (Figure <xref ref-type="fig"
                        rid="F8">8</xref>), but studies in 1956 showed that the introduction of the
                        <italic>allrum</italic> initially failed. Rather than being used as the
                    family room, as intended, it was used as a kind of salon or
                        <italic>finrum</italic> (literally, &#8216;nice room&#8217;), and it was
                    only with the introduction of TV sets during the early 1960s that the
                        <italic>allrum</italic> became a more everyday kind of space (<xref
                        ref-type="bibr" rid="B46">Krantz 1987: 103</xref>). Its popularity increased
                    from the 1970s onwards, finally making the idea of a salon or a
                        <italic>finrum</italic> (even if enacted within spaces tagged as living
                    rooms) obsolete.</p>
                <fig id="F8">
                    <label>Figure 8</label>
                    <caption>
                        <p><italic>Allrum</italic> with dinner table and a table designated for work
                            and play (with the kitchen in the background); interior design by Lena
                            Larsson. Photo from an apartment in &#8216;Das Schwedenhaus&#8217; at
                            the <italic>Interbau</italic> exhibition in Berlin 1957
                                (<italic>Byggm&#228;staren</italic>, 1957: 210).</p>
                    </caption>
                    <graphic xmlns:xlink="http://www.w3.org/1999/xlink"
                        xlink:href="/article/id/7592/file/110157/"/>
                </fig>
            </sec>
            <sec>
                <title>Absent Friends and the Ever-Changing Boundaries of the Dwelling</title>
                <p>In his book <italic>Objects of Desire</italic> (<xref ref-type="bibr" rid="B30"
                        >1986</xref>), Adrian Forty has argued that the modern Western home is
                    generally a product of the Industrial Revolution. Through the development of
                    specific work places, coupled with the regulation of work and work hours, the
                    home soon became an important haven of privacy, comfort and leisure: an antipode
                    to work (<xref ref-type="bibr" rid="B30">Forty 1986: 99</xref>). During the 19th
                    and 20th centuries, the boundaries of the home were also changing. Rooms and
                    functions that formerly were located outside the dwelling itself, like places
                    for food, bathing, laundry, latrines, etc., now moved inside the dwelling (<xref
                        ref-type="bibr" rid="B32">Gejvall 1988: 101</xref>). From a situation where
                    rooms could be rented out even without kitchen facilities (so-called bachelor
                    flats), the standard and comfort of living thus slowly began to increase. New
                    technical infrastructures, such as water pipes, were also introduced in several
                    Swedish cities during the 1860s (<xref ref-type="bibr" rid="B67">Paulsson 1950:
                        185</xref>), and the elevator, which afforded an easier movement of goods
                    and people in and out of the home, was introduced during the 1880s.</p>
                <p>New technology developed between around 1880 and 1920 made it possible to achieve
                    a degree of domestic comfort without servants and the accompanying spatial
                    separation between room types. Some room types were no longer needed, or their
                    functions could be integrated into other rooms. As we have seen, the number of
                    &#8216;indoor&#8217; room types seems to decline from about the 1920s and
                    onwards, and the decrease in secondary spaces outside the home proper actually
                    also continues slowly throughout the 20th century. During the 1930s and
                    &#8217;40s, storage spaces in cellars decreased (Gejvall 1998: 212), as
                    refrigerators and freezers became more common and fresh food could be bought all
                    year round. Another function that moved out of the home was child care. The
                    building of Swedish day-care centres in the 1940s and &#8217;50s meant that
                    child care in the home or in other people&#8217;s homes decreased. Bringing
                    laundry facilities closer to the home was another important issue during this
                    century. Collective laundry rooms with washing machines were introduced from the
                    mid-1920s by HSB (a Swedish cooperative association for housing); a national
                    suggestion for municipal regulation requiring laundry rooms was made in 1948
                    (Figure <xref ref-type="fig" rid="F9">9</xref>), and in 1965, 90% of the Swedish
                    population had access to a laundry room (<xref ref-type="bibr" rid="B10"
                        >Bj&#246;rkman 1985: 88</xref>; <xref ref-type="bibr" rid="B57">Lund
                        2009</xref>). However, in the 1990s a series of neighbourhood disputes
                    centred around these places, and as technical developments were made, washing
                    machines moved into apartments (into kitchens and bathrooms).</p>
                <fig id="F9">
                    <label>Figure 9</label>
                    <caption>
                        <p>The building of collective laundry rooms in housing areas increased in
                            Sweden during the 1940s. Here is an example from Klippan, built around
                            1940 (<italic>Byggm&#228;staren</italic> 1942: 295).</p>
                    </caption>
                    <graphic xmlns:xlink="http://www.w3.org/1999/xlink"
                        xlink:href="/article/id/7592/file/110158/"/>
                </fig>
                <p>Parallel to the privatization and movement of activities and goods into the home,
                    the possibility to actually harbour all of these objects and functions had grown
                    increasingly problematic. Although the rising problem of storage space was noted
                    already in an investigation in 1980 (<xref ref-type="bibr" rid="B44"
                        >Konsumentverket 1980</xref>), the decline of community spaces in the large
                    residential housing areas continued during the 1980s and 1990s, and storage
                    spaces today have to an extent been commercialized and outsourced, as new
                    companies specializing in storage facilities have developed, often in former
                    industrial areas (<xref ref-type="bibr" rid="B13">Brembeck 2019</xref>).</p>
                <p>Dwellings changed as new room types moved in and others moved out. This can
                    partly be explained by new technology (like water toilets, freezers, etc.), as
                    well as an ongoing urbanization in combination with higher living standards and
                    increasing consumption, which meant that storage spaces were externalised.
                    Activities that were once performed in the home are now executed in other
                    neighbourhoods, cities, regions or even countries (sites of production that were
                    formerly in the home might, for example, have moved to the other side of the
                    world). The home and its room types thus co-evolve with the environment in which
                    they are located. The absence or presence of the different activities of the
                    home seems, for example, to be related to longer trends such as technological
                    development, transformations from a rural to an urban society and
                    globalization.</p>
            </sec>
            <sec>
                <title>Contagious Room Types</title>
                <p>Related to yet different from the notion of absence or presence is the exchange
                    of room types between different building types. Until the 1960s, it was not
                    uncommon for the homes of rectors, cleaners, teachers, drivers or janitors to be
                    integrated into public buildings such as schools, museums, public baths, etc.
                    (Figure <xref ref-type="fig" rid="F10">10</xref>). Residential functions do,
                    however, disappear from public buildings with the growing tendency to see the
                    home as a protected and individualized unit separate from work, a place
                    exclusively reserved for leisure and a nuclear family life. The sharing and
                    exchange of room types between residential and non-residential building types
                    nevertheless continued. For example, the <italic>vilrum</italic> (resting room),
                    which was established as a Swedish room type at workplaces during 1940s,
                    appeared in residential buildings during the 1970s. Similarly, as larger
                    structures and building complexes became more common in the modernistic
                    large-scale plans of the 1960s and &#8217;70s, more traditionally urban
                    categories such as &#8216;square&#8217;, &#8216;area&#8217; and
                    &#8216;street&#8217; began appearing indoors. This is connected to the
                    state-subsidised large-scale housing projects in Sweden that began in the
                    mid-1960s, when housing blocks and houses took on a whole new scale (<xref
                        ref-type="bibr" rid="B2">Andersson 1976</xref>; <xref ref-type="bibr"
                        rid="B36">Hall &amp; Vid&#233;n 2005</xref>). Influenced by Team X, large
                    corridors were for example called &#8216;interior streets&#8217; in Bengt
                    Edman&#8217;s Sparta student housing in Lund in 1971. The suffix
                        -<italic>yta</italic> (area) also became more common, such as
                        <italic>arbetsyta</italic> (work area) or <italic>lekyta</italic> (play
                    area) (Figure <xref ref-type="fig" rid="F11">11</xref>). Indoor squares may not
                    be found in residential buildings, but they began appearing quite often in
                    schools, churches, commercial buildings and offices. There are also examples of
                    how residential room types move into non-residential building types; for
                    example, the <italic>allrum</italic> soon become popular in schools, and the
                        <italic>hobbyrum</italic> appeared in churches and parish halls from the
                    1960s and up until at least the 1980s.</p>
                <fig id="F10">
                    <label>Figure 10</label>
                    <caption>
                        <p>The Hovr&#228;tt (Court of Appeal) in Malm&#246;, designed by Ivar
                            Callmander (<italic>Arkitektur</italic> 1919: 139). The ground floor has
                            offices, an archive and an apartment for the building supervisor (on the
                            upper right side).</p>
                    </caption>
                    <graphic xmlns:xlink="http://www.w3.org/1999/xlink"
                        xlink:href="/article/id/7592/file/110159/"/>
                </fig>
                <fig id="F11">
                    <label>Figure 11</label>
                    <caption>
                        <p>Here we can see how the left part of the hall has been designated for
                            play with the inclusion of an early example of the room type
                                <italic>lekyta</italic> (play area). Row house designed by Gustaf
                            Lettstr&#246;m for the Housing exhibition H55 in Helsingborg
                                (<italic>Byggm&#228;staren</italic> 1955: 233).</p>
                    </caption>
                    <graphic xmlns:xlink="http://www.w3.org/1999/xlink"
                        xlink:href="/article/id/7592/file/110160/"/>
                </fig>
            </sec>
            <sec>
                <title>Trends of Different Temporal Scales</title>
                <p>The evolution of room types proceeds at no predictable pace; some develop slowly
                    and over a long time, whereas others might bloom during a short period of time
                    and then fade away. Old and new room types can thus always be found side by
                    side. One example of a short-lived trend was to refer to room types in a
                    diminutive form, by exchanging the suffix <italic>-rum</italic> for
                        <italic>-vr&#229;</italic> (nook). Due to the density of the population and
                    a housing shortage, there was in interest in the concept of small dwellings
                    during the late 1920s and &#8217;30s (<xref ref-type="bibr" rid="B10"
                        >Bj&#246;rkman 1985: 97</xref>), when small room types also developed, also
                    with the suffix -<italic>vr&#229;</italic>. The <italic>kokvr&#229;</italic>
                    (cooking nook, or kitchenette) makes its first appearance in 1927 as the most
                    long-lived and important of these types. Other examples include the
                        <italic>frukostvr&#229;</italic> (breakfast nook), introduced in 1920,
                        <italic>sittvr&#229;</italic> (sitting nook) 1925,
                        <italic>bokvr&#229;</italic> (book nook) 1927 and
                        <italic>arbetsvr&#229;</italic> (study nook) in the 1940s (Figure <xref
                        ref-type="fig" rid="F12">12</xref>). The suffix did not take off to the
                    extent first suggested, but it was not a total failure either. Some of the nook
                    types still exist, and new versions were also tried later (like the short-lived
                        <italic>ton&#229;rsvr&#229;</italic> (teenager nook) in public libraries
                    during the 1960s).</p>
                <fig id="F12">
                    <label>Figure 12</label>
                    <caption>
                        <p>House in V&#228;xj&#246; designed by G&#246;sta Br&#252;gger (presented
                            in <italic>Byggm&#228;staren</italic> 1946: 417). Here one can see a
                            small <italic>arbetsvr&#229;</italic> (study nook) next to the terrace.
                            The house also shows a late example of a <italic>borstrum</italic>
                            (brush room) next to the entrance.</p>
                    </caption>
                    <graphic xmlns:xlink="http://www.w3.org/1999/xlink"
                        xlink:href="/article/id/7592/file/110161/"/>
                </fig>
                <p>Another trend that peaked between the 1950s and the 1980s was room types related
                    to leisure, consumption and free time. For example, although it already existed
                    as a room type, the sauna suddenly became more popular during the &#8217;50s
                    (Figure <xref ref-type="fig" rid="F6">6</xref>). Rooms for hobbies, ping-pong
                    and weaving also appeared during these post-war decades, as well as storage
                    spaces specifically for sports equipment like skis and sleighs. Some rooms might
                    thus only live or thrive for a couple of decades, but there are also room types
                    that disappear even quicker. The &#8216;battery room for the door bell&#8217;
                    (on a plan from 1870) is one such very short-lived room; another one is the
                    bodega (Figure <xref ref-type="fig" rid="F13">13</xref>). These short-lived
                    rooms are quite often (but not always, as the case of the bodega shows) related
                    to new technology, and stabilized through what can be called network
                    stabilization (<xref ref-type="bibr" rid="B52">Law 2002</xref>); they depend on
                    a series of obligatory actors, such as laws, certain technical infrastructures,
                    etc. One example of this is the telephone room.</p>
                <fig id="F13">
                    <label>Figure 13</label>
                    <caption>
                        <p>The bodega room is a one-off room type in the journal
                                <italic>Byggm&#228;staren</italic> (1946: 433), and can be found on
                            the plans for a detached house in Tyres&#246; drawn by Holger Blom and
                            Jan Wahlman. The bodega room was placed in the basement and was intended
                            to be used as a kind of party room. The name did not quite catch on, but
                            the name <italic>gillestuga</italic> was later used for a very similar
                            room type that played an important role in Swedish dwellings from the
                            early 1960s and up to the 1980s.</p>
                    </caption>
                    <graphic xmlns:xlink="http://www.w3.org/1999/xlink"
                        xlink:href="/article/id/7592/file/110162/"/>
                </fig>
                <p>The long-lived room type, on the other hand, evolves slowly and mutates, like the
                        <italic>garderob</italic> (wardrobe), which over time changed almost beyond
                    recognition (Figure <xref ref-type="fig" rid="F14">14</xref>). In the plans of
                    Jean Eric Rehn&#8217;s Lambohov of 1762&#8211;66, the <italic>garderob</italic>
                    is a quite spacious through-way room with a window and a tiled stove. Throughout
                    the 19th century, however, the Swedish <italic>garderob</italic> was a small,
                    often dark, walk-in closet. It was quite popular, and there were often more
                    wardrobes in Swedish flats than in corresponding flats on the continent (Gejvall
                    1986: 240). Today, walk-in closets are more often referred to as
                        <italic>kl&#228;dkammare</italic> (clothes chamber), whereas
                        <italic>garderob</italic> more often refers to a standardized, built-in
                    piece of furniture for clothes (cf. <xref ref-type="bibr" rid="B73">Rybczynski
                        1986</xref>).<xref ref-type="fn" rid="n7">7</xref></p>
                <fig id="F14">
                    <label>Figure 14</label>
                    <caption>
                        <p><italic>Garderob</italic> (wardrobe) on plans from the 1760s (Lambohov by
                            Jean Eric Rehn), 1890s (apartment in J&#246;nk&#246;ping by F.
                            Sundstr&#246;m) and 1960s (Villa in Skan&#246;r by VBB). In the last
                            image, the <italic>garderob</italic> is marked with &#8216;G&#8217; and
                            built in as a standardized storage cabinet (details from plans in <xref
                                ref-type="bibr" rid="B77">Selling 1937: 215</xref>; <xref
                                ref-type="bibr" rid="B82"><italic>Teknisk tidskrift, Afd. F&#246;r
                                    byggnadskonst</italic>, 1897: pl. 16</xref>;
                                <italic>Arkitektur</italic> 1964: 282).</p>
                    </caption>
                    <graphic xmlns:xlink="http://www.w3.org/1999/xlink"
                        xlink:href="/article/id/7592/file/110163/"/>
                </fig>
                <p>Other very long-lived room types manage to resist evolution and to some extent
                    remain the same over centuries. A case in point is the kitchen. Kitchens may
                    have changed from closed to integrated, small to large, but they are still
                    recognizable as kitchens. The kitchen relies on a more fluid stabilization
                        (<xref ref-type="bibr" rid="B53">Law and Mol 1994</xref>); i.e., actors may
                    come and go, new ones may be added, others may disappear. Fluid stabilization
                    does not rely on a specific set of actors, but more on a family resemblance
                    between actors. The associations between actors might change &#8212; as long as
                    changes are not too abrupt, new actors might be welcomed or released from
                    &#8216;the family&#8217;. One way of illustrating the fluidity and versatility
                    of the kitchen as a category is through its many variants. In the plans studied,
                    from 1750 to 2010, at least 35 different kinds of kitchen types appear,
                    including the quite common <italic>grovk&#246;k</italic> (literally,
                    &#8216;rough kitchen&#8217;, which is the Swedish term for a scullery), sandwich
                    kitchens, milk kitchens, children&#8217;s play kitchens (Figure <xref
                        ref-type="fig" rid="F15">15</xref>), training kitchens, tea kitchens, paint
                    kitchens (<italic>f&#228;rgk&#246;k</italic>, found in theatres), and barium
                    kitchens (found in children&#8217;s hospitals).<xref ref-type="fn" rid="n8"
                        >8</xref></p>
                <fig id="F15">
                    <label>Figure 15</label>
                    <caption>
                        <p>Children&#8217;s play kitchen, or <italic>lekk&#246;k</italic>
                                (<italic>Byggm&#228;staren</italic> 1951: 451).</p>
                    </caption>
                    <graphic xmlns:xlink="http://www.w3.org/1999/xlink"
                        xlink:href="/article/id/7592/file/110164/"/>
                </fig>
            </sec>
            <sec>
                <title>Prototypical Sets</title>
                <p>During the period 1750 to 2010, Sweden developed from a rural to an urban society
                    less focused on production and more on leisure and comfort. In cities,
                    residential room types such as the dining room, salon and gentleman&#8217;s
                    room, thrived and evolved during the 19th century. However, many rural room
                    types disappeared during the same time (cf. <xref ref-type="bibr" rid="B27"
                        >Erixon 1947</xref>). The first Swedish norms and recommendations around
                    housing, and its minimal requirements, were published in 1921, and a more proper
                    Swedish science around housing started with the foundation of the research
                    institute on housing (<italic>Hemmets forskningsinstitut</italic>) in 1944.
                    These efforts eventually led to better living conditions, but also to
                    standardization, and to fewer and more uniform room types. In fact, the number
                    of residential room types appears to have decreased over the centuries, reaching
                    its minimum with a small set of general (and on plans often nameless),
                    standardized room types in the 1960s and 70s.</p>
                <p>The stabilization of a series of aligned room types (first by research and then
                    by state recommendations and legislation), is related to the home as a
                    stabilized type. The home grows more and more stabilized as a place of comfort
                    and retreat, but also of functional efficiency. The increasing research on
                    residential room types during the 20th century &#8212; how to design kitchens
                    that were easy to work in (<xref ref-type="bibr" rid="B83">Thiberg 1968</xref>)
                    or bathrooms that were easy to clean (<xref ref-type="bibr" rid="B56">Linn
                        1985</xref>), etc. &#8212; together with the decrease in the number of room
                    types, also paved the way for the standardization of a set of obligatory room
                    types (bedroom, kitchen, bathroom, living room). The home became a type produced
                    &#8216;from a standard &#8220;kit of parts&#8221;&#8217; (<xref ref-type="bibr"
                        rid="B80">Steadman 2014: 358</xref>).</p>
                <p>The general decline in the number of room types also means that some rooms had to
                    take in activities which had previously been performed in a set of other rooms;
                    the bathroom, for example, now includes activities which formerly might have
                    been done in boudoirs, laundry rooms, nurseries and dressing rooms (<xref
                        ref-type="bibr" rid="B73">Rybczynski 1986: 223</xref>). The bedchamber, the
                    children&#8217;s chamber and the guest room were all transformed into the more
                    standardized &#8216;bedroom&#8217;. From the 1960s and 1970s, the names of
                    residential room types also began to disappear from plans in the journal
                        <italic>Arkitektur</italic>. Since these room types were now rather few and
                    tended to be the same from house to house, year after year, there was no need to
                    mark them out. In the early 1990s, however, this changed. The Swedish building
                    standard for room sizes was abandoned, and the building code no longer dictated
                    a detailed prescription for the layout of housing plans, which in turn opened
                    the way for new room types, as well as a new fluidity when it came to the
                    existing ones. The names of room types on residential plans become somewhat more
                    common again, and new types, such as the relaxation room and the spa, have
                    appeared, a trend that seems to continue during the 2000s.</p>
            </sec>
        </sec>
        <sec>
            <title>Conclusions</title>
            <p>The aim of this article has been to explore an evolutionary approach to room types,
                arguing that the historical development of room types should not be studied on the
                basis of single entities, but must be understood in relation to other room types and
                their ecology &#8212; in the house and elsewhere, and at other times. From the study
                of Swedish residential plans, I have derived and discussed six themes that are most
                probably not unique to Sweden (even though they sometimes took a particular form in
                Sweden), but are similar to trends in other European countries. After all, Sweden
                was entangled with the development of residential cultures in other countries
                &#8212; like France during the 18th century (with an emphasis on rooms such as the
                salon), Germany (with the influence of the <italic>Herrenzimmer</italic>) and later
                Britain (with the hall plan) during the 19th century.</p>
            <p>Room types tend to come and go in packs, and they seem to be subject to
                    <italic>thresholds of evolution and extinction</italic>. Room types can,
                however, also be more <italic>abruptive</italic>. Although room types often are
                associated with each other during longer times, single room types can also come and
                go suddenly (like the divan room or the <italic>allrum</italic>). Room types are
                also always dependent on &#8216;<italic>absent friends</italic>&#8217;. The room
                types associated with a certain place, such as the home, are produced in relation to
                the environment of this place. There is thus a constant exchange of room types as
                the home and its environment are co-produced over time. Furthermore, some room type
                trends are <italic>contagious</italic>. Room types do not stick to specific building
                types but can spread between different contexts and be reused or reinvented across
                different building types or urban types (for example, between homes, schools and
                churches, between cities and buildings, etc.). Series of rooms also follow
                    <italic>different temporal scales</italic>, that is, old and young room types
                often live side by side. Room types that are stabilized through a series of
                obligatory actors seem to be more short-lived than the more fluid territorial sorts.
                Finally, room types can stabilize into <italic>prototypical sets</italic>, the
                obligatory room types that tend to make up a certain place or building type.</p>
            <p>It is fruitful to discuss room types as a kind of spatial species. Rather than
                separating them into use types or form types, we address them as important and
                transformative actors in architectural and societal production. Individual
                differences always have the potential to be the start of a new species and if we are
                interested in studying this change &#8212; types on the move (cf. <xref
                    ref-type="bibr" rid="B51">Latour and Yaneva 2008</xref>) &#8212; we cannot
                reduce the notion of type to a certain category, but need to follow all the
                different ways in which it makes a difference. When looking at how types transform,
                the question is thus not whether they are defined by form or use, but how they have
                an effect on ongoing life, how they keep or change their identity and how they
                evolve, decline or even die.</p>
        </sec>
    </body>
    <back>
        <fn-group>
            <fn id="n1">
                <p>On a more general note, a focus on types might also risk a focus on spaces as
                    objects, obscuring situations and practices (see, for example, Carl 2011 on the
                    relation between &#8216;type&#8217; and the &#8216;typical&#8217;).</p>
            </fn>
            <fn id="n2">
                <p>At that time, there was no longer any need for someone to keep an eye on the
                    building during evenings and weekends (keeping the fire going to heat the
                    building, etc.). Housing became more affordable and readily available during the
                    1960s, and the idea of &#8216;the home&#8217; was also changing rapidly during
                    the post-war decades. Home became a place of leisure, and more firmly separated
                    from the place of work (see, for example, <xref ref-type="bibr" rid="B30">Forty
                        1986</xref>).</p>
            </fn>
            <fn id="n3">
                <p>The journal <italic>Arkitektur</italic> was published in Stockholm by Arkitektur
                    f&#246;rlag between 1901 and 2010, and appeared under the following titles:
                        <italic>Arkitektur och dekorativ konst</italic>, from 1901 to 1908;
                        <italic>Arkitektur</italic>, from 1909 to 1921;
                        <italic>Byggm&#228;staren</italic>, from 1922 to 1959; and
                        <italic>Arkitektur</italic>, from 1960 to 2010.</p>
            </fn>
            <fn id="n4">
                <p>See <ext-link ext-link-type="uri" xmlns:xlink="http://www.w3.org/1999/xlink"
                        xlink:href="https://www.saob.se/in-english/"
                        >https://www.saob.se/in-english/</ext-link> for more information.</p>
            </fn>
            <fn id="n5">
                <p>The name <italic>vardagsrum</italic> also related to the everyday room of the
                    rural dwelling sometimes also called <italic>dagligrum</italic> or
                        <italic>dagligstuga</italic> (<xref ref-type="bibr" rid="B27">Erixon
                        1947</xref>).</p>
            </fn>
            <fn id="n6">
                <p>In Swedish: <italic>herrum</italic>, similar to the German
                        <italic>Herrenzimmer</italic>. The room type does not seem to have any
                    direct equivalent in the English house (cf. <xref ref-type="bibr" rid="B64"
                        >Muthesius 1979: 87</xref>).</p>
            </fn>
            <fn id="n7">
                <p>The old French version of the large <italic>garderob</italic> thus disappeared in
                    Sweden during the early 19th century, but seems to have lived on much longer in,
                    for example, Germany.</p>
            </fn>
            <fn id="n8">
                <p>The sandwich kitchen was a small kitchen for preparing sandwiches, and first
                    appeared on Torben Grut&#8217;s plans for Stockholm Stadium, built
                    1910&#8211;1912. Milk kitchens were used to prepare milk for small children, and
                    could be found in Swedish daycare centers from the 1940s, but also, for example,
                    in Sven Markelius&#8217; Collective house in Stockholm (1935).</p>
            </fn>
        </fn-group>
        <sec>
            <title>Author&#8217;s Note</title>
            <p>The material of this article was primarily compiled by the author, but I would also
                like to thank Gustav K&#228;rrholm and Jack Nilsson for their assistance. The
                research of this article was also, in part, supported by the Swedish Research
                Council Formas, through the research project &#8216;Crush &#8212; Critical Urban
                Sustainability Hub&#8217; (grant number 2013-01794).</p>
        </sec>
        <sec>
            <title>Competing Interests</title>
            <p>The author has no competing interests to declare.</p>
        </sec>
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