Tansu is the traditional mobile storage cabinetry indigenous to Japan. Tansu was first recorded in the Genroku era of the Edo Period (1688–1704). The two characters, TAN and SU, appear to have initially represented objects with separate functions: the storage of food and the carrying of firewood. Since the radical for bamboo appears in each of these characters, it may be conjectured that wood was not as yet used.