Tatami
Japan has etiquette about tatamiberi. Japanese are taught not to step on the tatamiberi. It is easy to tear tatamiberi when stepping in the weakest part. Stepping on tatamiberi fades the color on the edge of cotton and hemp in the tatami. Therefore, etiquette means "not to hurt the mat carelessly stepping when you visit another house, pay it attention". Also, family crests were embroidered on the tatamiberi'' in old times, too. Stepping on the family crest was taboo.