In Japanese Zen Buddhism, a verbal puzzle known as a “koan” is often used to frustrate the process of logical thought to encourage the student to look beyond the boundaries, or limitations, of their ...

There is a famous story about a Zen master who asks an overconfident student, "OK, Mr. Know-it-All" -- or words to that effect -- "if you're so enlightened, what is the sound of one hand clapping?" ...