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Origami Black Hole xkcd.com/3033

There's an assumption here that the paper never gains thickness as it's folded.

Well, no, the joke is more in the dimension this paper would have in the end 🥲

But folding a paper never makes it denser...? 🤔

Right, which is why I said what I said. But that's still the joke, because that's how you could get to a black hole or, as the alt text says, nuclear fusion along the way. If the joke was about it's thickness, the comic would have said something about it's thickness.