After the two previous series of posts on minka structure (kо̄zо̄ 構造), in which we examined how minka are put together, and minka layouts (madori 間取り), in which we looked at how minka are partitioned into functionally differentiated rooms or spaces, we will now begin a new series, on minka interiors (naibu 内部). This series will be more concerned with the particulars of how people lived in and interacted with the minka and its appurtenances, and so will be less technical and more anthropological or ethnographical in content than the previous two. Like those series, however, this will be a loose translation of Internal Layouts, Structure, and Interiors (Madori・Kо̄zо̄・Naibu 間取り・構造・内部), the second volume of Kawashima Chūji’s (川島宙次) three-volume work on minka titled Disappearing Minka (Horobiyuku Minka (滅びゆく民家); with the completion of this series, we will have basically covered all of Volume Two of that work. The first and third volumes, incidentally, are Roofs and Exteriors (Yane・Gaikan 屋根・外観) and Sites/Auxiliary Structures and Typologies (Yashiki-mawari・Keishiki 屋敷まわり・形式) respectively; these volumes may also get their own series here eventually.
Kawashima’s work on minka interiors covers such elements as firepits (irori いろり) and the various devices and seating conventions associated with them; stoves (kamado かまど); facilities and customs relating to the use of water (mizu 水); sleeping places (nedoko 寝所); ‘living rooms’ (hiroma 広間) and ‘guest rooms’ (dei 出居); ‘formal rooms’ (zashiki 座敷) and their decorative alcoves (toko-no-ma 床の間); perimeter spaces (engawa 縁側); bathing rooms (yoku-shitsu 浴室) and bathing facilities; toilets (benjo 便所); formal entries (genkan 玄関); and stairs (kaidan 階段).
Let’s begin then, with an examination of the irori (いろり or 囲炉裏 or simply 炉): the hearth or ‘firepit’ of the traditional Japanese home.
The irori is the primary and cardinal element of the minka interior, at the centre of the core activities of the dwelling and also at its symbolic heart. In Japan’s earliest residential structures, the prehistoric pit dwellings (tate-ana jūkyo 竪穴住居) and ‘on ground’ or ‘on grade’ dwellings (hirachi jūkyo 平地住居) of the Jо̄mon period, fires were contained in jiro (地炉, lit. ‘earth furnace’), basically an indoor campfire dug into the earthen floor and given a border of large rounded river stones (tama-ishi 玉石), or, in later examples, shaped or dressed stone. Jiro persisted into the 20th century in the earth-floored utility areas (the doma or niwa) of minka, and in the living areas of ‘earth-sitting’ (doza 土座) dwellings, i.e. dwellings without a raised-floor area.
In the earliest raised-floor dwellings (taka-yuka jūkyo 高床住居), whose mode of living eventually came to predominate in the country’s southern regions, constructing a fireproof enclosure or ‘container’ (irori can be written with the single character 炉, lit. ‘furnace’ or ‘kiln’) for the fire was considered difficult, or at least not worth the effort, since in these warmer climates, where an indoor heat source was not necessary or even desirable, the fire could be exterior to the dwelling. This explains why irori are still most densely distributed in the colder Tо̄hoku and Hokuriku regions of eastern Japan. In later periods, once methods for installing them into raised timber floors were developed, irori were also widely adopted in the minka of the mountainous areas of western Japan, such that today we can no longer draw a hard distinction between regions that use irori and those that use only stoves (kamado かまど or 釜土).
Irori are typically square in shape, and range in size from half a tatami mat to a full tatami mat in area (from around 91cm x 91cm to around 130cm x 130cm). There are various methods of construction, but the typical example consists of a concave base of stones or rubble built up below the floor to the level of the floor bearers; this base is lined with clay, on which is laid down a layer of sand, then ash. There are regions in which the perimeter part of the irori is finished with fine white plaster (shikkui 漆喰) or cement, with the central part left unplastered.
The perimeter timber frame, typically called the ro-buchi (炉縁, lit. ‘furnace edge’), is either flush with or somewhat higher than the finished floor level. It and the ‘walls’ of the irori usually surround the pit on all four sides, to fully contain the fire and ash, though there are regions in which one side of the irori abuts and is open to the doma, allowing direct access to the fire from that side; this type of irori has the advantage of allowing transfer of food, pots, and fuel from the doma to the irori without having to remove one's shoes and step up into the room, and also makes the removal of ash easier.