A tatami (畳?
Traditionally made of rice straw to form the core (though nowadays sometimes the core is composed of compressed wood chip boards or polystyrene foam),
made in uniform sizes.
Tatami mats are a traditional type of Japanese flooring.
Traditionally made of rice straw to form the core (Usually, on the long sides, they have edging (heri) of brocade or plain cloth, although some tatami have no edging.
tatami were only used as seating for the highest aristocrats.
In the Kamakura period, there arose the shoin-zukuri architectural style of residence for the samurai and priests who had gained power.
rules concerning seating and etiquette determined the arrangement of the tatami in the rooms.
Tatami were gradually popularized and finally reached the 17th century.
Tatami mats in Japanese culture are flooring surfaces to be kept as clean as a bed surface or dining table surface.
Nowadays, they are commonly associated with Japanese religious rites and the tea ceremony.
Most modern Japanese homes still have at least one tatami room, the washitsu which is furnished and decorated in the traditional Japanese style.
Tatami are also used when training in Japanese martial arts, such as judo, for protective purposes.