a Zen koan:

"Hairy" Potter
Originally uploaded by idogcow

One day Chuang-tzu and a friend were walking along a riverbank. "How delightfully the fishes are enjoying themselves in the water!" Chuang-tzu exclaimed.

"You are not a fish," his friend said. "How do you know whether or not the fishes are enjoying themselves?"

"You are not me," Chuang-tzu said. "How do you know that I do not know that the fishes are enjoying themselves?"