i love math even though i'm not good at it. when i see an equation, or when i look at a letter/number/character, even, i see it as a shape or an object. do you realize how pretty these things can be when you see them in a different way? and when you put these characters together to form an equation, manipulate, and make it visual?
anyway, here are a couple of sites i think are pretty cool.
so much more out there, but i like these in particular.