"What is the sound of one hand clapping?" is a koan from this school of Mahayana Buddhism
The Soto school of Zen Buddhists 
emphasize sitting, called zazenZazen is the Japanese term for the practice of 
sitting... [DOC] [TLE] Unique Teachings of Zen Buddhism | Our Everyday Life [PAR] The teachings of Zen Buddhism differ fundamentally from other schools of 
Buddhism.