Many of us are familiar with the Chinese practice of tapping fingers on the table to signify thanks, as after the pouring of tea or other beverages. Likewise, the alleged beginnings of this practice as a covert way to honor an emperor traveling incognito.
I recently had dinner with a Japanese business executive who did this. Despite several weeks' travel in Japan on four occasions, I hadn't previously noticed its use by Japanese. Is this a common practice in Japan that I just never noticed? Where else is it common? I ask partly out of curiosity, and partly to know when the gesture might suit.
Thanks-
DM