Tatami Room and Shoji - In traditional Japanese architecture, a shoji is a door, window or room divider consisting of translucent paper over a frame of wood or bamboo. While washi is the traditional paper, shoji may be made of modern paper. Shoji doors are designed to slide open, and thus conserve space that would be required by a swinging door. They are used in traditional houses especially in tatami rooms. Tatami mats are a traditional type of Japanese flooring. Traditionally made of rice straw to form the core though nowadays sometimes the core is composed of compressed wood or styrofoam, with a covering of woven soft rush straw. Tatami are made in uniform sizes. Standard tatami are rectangular and are exactly twice as long as they are wide. Usually they have edging of brocade. Tatami were originally a luxury item for the nobility while the lower classes had mat covered dirt floors.