This Japanese-style toilet (closed to the public) in Hotel Gajoen Tokyo has a stall the size of a modest room. The semicircular hood on the far end of the receptacle is the kinkakushi.
The author with a hibako. This particular pot, used by members of the upper classes, was designed so that servants could discard the waste from under the floor.
As toilets shifted from wood to ceramics, the kinukake became slab shaped before taking on the semicircular shape seen in the background.
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