• Tatami mats, made of woven rush straw and edged in cloth, are traditional Japanese flooring once reserved for the wealthy. • Classically 90 cm by 180 cm, with Kyoto mats a bit larger in size.
• Room size is generally measured in how many tatami mats would fit the floor space. Usually part of a washitsu, or traditional room with sliding shoji screen doors, tokonoma (raised alcove 床の間), and mizuya (水屋) for the tea ceremony preparation.