Thinking Outside the Plane: https://www.metafilter.com/183649/Thinking-Outside-the-Plane
Interesting roundup of 3d solutions to 2d problems, starting with Tarski's plank problem: Can you cover a diameter-\(n\) disk with fewer than \(n\) unit-width strips?
Sadly, they missed the 3d proof of Desargues' theorem: https://en.wikipedia.org/wiki/Desargues%27s_theorem#Three-dimensional_proof
There's also a 2d-3d connection with Miquel's six-circle theorem but I think it goes the other way: https://11011110.github.io/blog/2006/03/22/miquels-six-circles.html
A Mastodon instance for maths people. The kind of people who make \(\pi z^2 \times a\) jokes.
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