I guess I first learned about meditation in the Beatle’s little-known song called “Tomorrow Never Knows”
The best known of these is the question, what is the sound of one hand clapping? The master would send the student off to ponder this question. Invariably, the student would return with an answer to the riddle. Opening and closing your hand rapidly does make noise, so this would be one of the student’s guess. The master would simply say, “wrong”.