Tatami is very common in Japanese houses and I was told you're not even really supposed to wear hard-soled slippers on it. https://en.wikipedia.org/wiki/Tatami

Tatami is very common in Japanese houses and I was told you're not even really supposed to wear hard-soled slippers on it. https://en.wikipedia.org/wiki/Tatami https://en.wikipedia.org/wiki/Tatami