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Nov 25, 2010 at 19:13 comment added Qiaochu Yuan @Ollie: then you'll love geometrygames.org/HyperbolicGames .
Nov 25, 2010 at 4:26 comment added Ollie You can also talk about how people living in a 2-D universe could tell what `shape' it is - how do we generalise this to the 3-D case. By far the best tool I've ever found for this is the Asteroids game play.vg/games/4-Asteroids.html Anyone who's ever played it will love the fact it's a universe with genus 1.
Nov 24, 2010 at 19:50 comment added Chris Schommer-Pries You can also use a deflated soccer ball for this demonstration. This way you can show that the number is measuring something about the ball, but not a rigid thing. It is not exactly its "roundness", but something else. Then whip out the torus.
Nov 24, 2010 at 13:03 history answered Steven Gubkin CC BY-SA 2.5