A shoji is a sliding screen with a wooden lattice built into a rectangular wooden frame. Washi paper is affixed to the shoji to allow gentle sunlight to penetrate the screen. A shoji is used not only as a door but also as a room divider. Unlike shoji screens, these are made of thick washi paper stretched over a wooden frame and provide more privacy than shoji screens. Washi is well suited to the Japanese climate because it regulates the humidity of the house by absorbing and releasing moisture. Also, by using sliding doors instead of walls, Japanese homes offer more options.