Shoji sliding doors are a style of Japanese sliding door. Interior walls of houses constructed with shoji sliding doors can be removed from their tracks to expand the rooms for parties. The Japanese shoji sliding doors are made of translucent white paper over a lattice-like frame of wood. Traditionally, the paper used for shoji doors was washi, made from a tree called kozo (in the same family as the mulberry tree). Modern-day materials, including plastic, may be now be used.