Genius! I don't know if this is a Thai invention but certainly it came from the mind of a someone of the Asian persuasion because no Asian people are going to let you wear shoes in the house. Truthfully the mystery is why do Westerners insist on wearing shoes which have trod the filthy streets of their cities, within the luxury and comfort of their home. Since you're going to be in slippers, why not do a bit of buffing while you slide around the abode. Genius!