I think the question was mistranslated or something:

The sound of one hand
Two hands clap and there is a sound. What is the sound of one hand?
— Hakuin Ekaku
"...in the beginning a monk first thinks a koan is an inert object upon which to focus attention; after a long period of consecutive repetition, one realizes that the koan is also a dynamic activity, the very activity of seeking an answer to the koan. The koan is both the object being sought and the relentless seeking itself. In a koan, the self sees the self not directly but under the guise of the koan...When one realizes ("makes real") this identity, then two hands have become one. The practitioner becomes the koan that he or she is trying to understand. That is the sound of one hand." — G. Victor Sogen Hori, Translating the Zen Phrase Book[10]
This particular koan has a number of famously spurious or incorrect answers in American pop culture. These include Bart Simpson flapping his fingers against his palm, snapping fingers, slapping the teacher's face, the sound of dead air (usually crickets) as a joke falls flat (a "white out", in the Japanese), and other drollery. Simply because the subject is imbued with reverence does not preclude imbuing failure to understand with irreverence.



That is a hell of a lot more philosophical than "what is the sound of one hand clapping". That question implies that one hand is clapping, which makes no sense as in order to clap you have to have two surfaces. So basically, WHO CARES. IT'S FOR STUPID BALD MONKS TO THINK ABOUT WHILE THEY MEDITATE.