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1.
Conway's Magical Pen (conwaysmagicalpen.com)
2 points by RiderOfGiraffes to recreational math 3 days ago | discuss
2.
Conway's Circle Theorem (wikipedia.org)
2 points by RiderOfGiraffes to recreational math 3 days ago | discuss
3.
A Puzzle About Puzzles (solipsys.co.uk)
2 points by RiderOfGiraffes to recreational math 108 days ago | discuss

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