Did you know it's possible to cut a hole in a cube such that an identical cube can fit inside it? Really! It's called "Rupert's Property." *All Platonic solids are Rupert!* Except one new shape, which *cannot* fit inside itself. This eldritch polygon is called a Noperthedron!

arxiv.org/pdf/2508.18475

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If you'd like an essay-formatted version of this thread to read or share, here's a link to it on pluralistic.net, my surveillance-free, ad-free, tracker-free blog:

pluralistic.net/2025/08/30/mer…

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