‘A monk named Nan-in received a visit from another monk named Tenno. Tenno had finished his apprenticeship and become a teacher. Since it was raining, Tenno wore wooden clogs and carried an umbrella. After greeting his guest, Nan-in asked, “I suppose you left your wooden clogs in the entryway. Please tell me if your umbrella is on the right or left side of the clogs.” Tenno did not know where he had placed his umbrella. He could see that he was unable to practice mindfulness of forms moment after moment. Though already a teacher, he became Nan-in’s student and studied six more years with him.’ (from Zen Flesh, Zen Bones)