John opens the Harvest Moon retreat at the Angela Center with an ancient Koan about a buffalo passing through a lattice window. “To give an example, it is like a buffalo passing through a window. Its head, horns and four legs have all passed through. Why is it that its tail cannot?” Meditate on the tail and the question of the tail. What is the tail, why could a huge buffalo enter but the tail cannot? October 13, 2013.