Japanese households often consist of both Japanese style rooms with tatami floors, and modern rooms with wooden or tiled floors. Tatami mats are made of straw and measure roughly 180 cm x 90 cm. You should always take off your slippers when stepping on tatami mats in order to protect them from damage.
Traditional tatami rooms have an alcove (tokonoma) in which a hanging scroll (kakejiku) and a flower arrangement (ikebana) or piece of pottery is displayed. The room entrances are sliding paper doors (fusuma) and sliding paper screens (shoji) which can be removed completely.