ホモテナシ

According to Ulrich, time between blinking. When you blink, all is past. Also the name of a 楽 bowl.

百丈懷海 (Baizhang Huaihai, Jap: ひゃくじょう　えかい) (720–814) walked with his master and they see some ducks fly by. What was that? Wild ducks! Where did they go? They flew away. The master then grabs 百丈's nose and twists it: Where could they have flown off to? (They are still there!) and 百丈 was enlightened.