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Aperiodvent, Day 4: Hyperbolic Non-Euclidean World and Figure-8 Knot

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This old-school website, put together by Japanese electronic engineer Tadao Ito, explains non-Euclidean and hyperbolic geometry, projective geometry, and some properties of the figure-eight shape (genus 2 torus) – with some lovely diagrams. Worth a dig through!

This is part of the Aperiodical Advent Calendar. We’ll be posting a new surprise for you each morning until Christmas!

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