Shuzan, a Buddhist monk of the tenth century, once held up a bamboo stick before his disciples. "Call this a stick," he bellowed, "and you assert; call this not a stick, and you negate. Now, do not assert or negate, what would you call this stick? Speak! Speak!" From out the ranks, a young monk ventured forth, grabbed the bamboo, and, breaking it in two, exclaimed to Shuzan, "What is this?