Kyogen said, 'It is like a man up in a tree hanging from a branch with his mouth. His hands grasp no branch, his feet rest on no limb. Someone appears beneath the tree and asks, "What is the meaning of Bodhidharma coming from the West?" If he does not answer, he fails. If he does answer, he falls and loses his life. What should he do?'

Mumonkan, Case 5