A berth of this kind is enclosed but not separate. It has a shell, a mattress, a light and a screen at the opening, and it stops there: the shell carries no plumbing, no window and no lock, because it is not a room and was never meant to pass for one. What it offers is a boundary you can draw around yourself in a house full of strangers.
The form was worked out in Osaka at the end of the nineteen-seventies and has changed less than might be expected.1 Later houses widened the shell, raised the partition or traded the moulded unit for a fitted compartment, but the arrangement held: a stack of berths along a corridor, and everything that needs a drain kept elsewhere.
Note 1
Capsule Inn Osaka
Osaka, Japan
The house that began the form, opened in Umeda in 1979 to a design by Kisho Kurokawa, and still receiving guests. Its berths are moulded units in two tiers along a corridor, with a bathing floor below. The operator states that it takes men only.
SleepingMoulded berths in two tiers; bathing floor held in common