> “Once you see it, you just say ‘Aha! Of course!’” These are my favorite kinds of things to learn. Once seen, they can't be unseen and can upend how I think

> “Once you see it, you just say ‘Aha! Of course!’” These are my favorite kinds of things to learn. Once seen, they can't be unseen and can upend how I think of the world in some domain D.