I found this joke in the index of an actual programming textbook — "recursion: see recursion" — and sat in the school library grinning like I'd discovered a secret door. It's the perfect joke because it doesn't just describe the concept, it is the concept: a definition that calls itself, no base case, turtles all the way down. If you know, you've already looped through it twice reading this. If you don't, look up recursion. Then look up recursion. Somewhere around the third pass, either you'll get it or the stack will overflow. Both are traditional.

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