It is well known that Fudebakudo masters, drawing on the tradition of Zen, often torment and bemuse their students with koans. Sometimes a single koan is thrown before a student to disrupt reliance on the intellect as a tool for understanding reality. At other times, a whole line of koans is used as a test of equinamity. Koans, once understood, are usually not discarded but instead left behind on the Way as both obstacle and encouragement to those who follow. Fudebakudo students recognise them as tokens indicating that an enlightened master has passed ahead.
Examples of classical Fudebakudo koans:
This post was formerly in the Forum. I was reminded of it during a contemplative moment (as a passenger) on the A34 (I think) on the way to Bicester at the weekend.