Encyclopedia Galactica

If you're like me, you have no problem understanding hyperbolic space intellectually, but may have trouble visualizing a space that expands in all directions the further you go. Well, wonder no more. Mathematician Daina Taimina from Cornell has made physical models in crochet - you can do it yourself and have hyperspace models you can touch and feel.

Here's one: The more you increase as you crochet, the more 'folded' the space becomes: ... until it's really really twisty: Further proof, if you needed it, that the Internet is the Compendium of All Human Knowledge.