A second set of shorter posts, similarly supported bv partially buried stones, holds up the platform that is the floor, a wooden deck of closely fitted planks set about two feet above the earth. The outer perimeter of the flooring becomes a veranda or walkway, called the engawa, and the inner space is partitioned into rooms by light walls of paper, plaster, and wooden grillwork. The outer walls of the house, which serve no structural purpose, are sliding latticework panels called shoji, which are covered with translucent white rice paper, bathing the exterior rooms in a soft daytime light. The shoji, ordinarily installed in pairs approximately six feet high and three feet wide, unite rather than divide the interior and exterior; during the summer they slide open to provide fresh air and direct communication with the outdoors. If greater insulation or safety is required, a second set of sliding panels, or amado, similar in appearance to Western doors, may be installed outside the shoji. Between columns too narrow to accommodate a pair of shoji there may be a solid wall consisting of a two-inch-thick layer of clay pressed into a bamboo and rice-straw framework and finished inside and out with a thin veneer of smooth white plaster. Similar walls may be built inside the house where appropriate, and they and the columns are the house's only solid surfaces. The dull white color and silken texture of the plaster walls contrast pleasantly with the exposed natural grain of the supporting columns.
Interior rooms are separated by partitions consisting of light wooden frames covered in heavy opaque paper, often decorated with unobtrusive designs. These paper walls, called fusuma, are suspended from tracks attached to overhead crossbeams. They slide to form instant doorways, or when removed entirely, convert two smaller rooms into one large apartment. Fusuma provide little privacy between rooms except a visual screen, and it is rumored that this undesired communication increasingly inhibits lovemaking by modern parents.
The overhead crossbeams, installed between the columns at a height of slightly over six feet, are similar to the columns in diameter and appearance. The ceiling of the rooms is roughly two feet above the crossbeams, or kamoi, with the intervening space usually filled either by a vertical open wooden latticework, the ramma, or a plaster-and-board combination, the nageshi. On exterior walls of the ramma is ordinarily a solid extension of the shoji which inhibits air flow from the outside. The kamoi, nageshi, and ramma have a structural as well as aesthetic obligation; they