The clapping of one hand
Didn't you guys know that "one hand clapping" has been solved--by Bart Simpson? You might think this is just a joke, but there might be something to be learned here.
From The Simpsons
Season 2, Episode 19: "Dead Putting Society"
As haunting music plays, Bart and Lisa sit in the lotus position alongside a lake.
Lisa: I want you to shut off the logical part of your mind.
Lisa: Embrace nothingness.
Bart: You got it.
Lisa: Become like an uncarved stone.
Lisa: Bart, you're just pretending to know what I'm talking about!
Lisa: Well, it's very frustrating!
Bart: I'll bet.
Lisa and Bart sit atop of a mountain.
Lisa: What is the sound of one hand clapping?
Bart: Piece of cake. [bends fingers and claps palm]
Lisa: No, Bart, it's a 3000-year-old riddle with no answer. It's supposed to clear your mind of conscious thought.
Bart: No answer? Lisa, listen up! [bends fingers and claps palm]