This discussion is going more and more interesting, on math representation now... Even if I'm blind now since a couple of years, I have personnally remain quite a visual person when dealing with math. I know that it could be confusing for some people, but it's true.
When I was 15-18 in school right after secondary school (I don't know precisely how you call this in english), I was quite good a solving geometrical problems involving 3D vectors. In fact, I can imagine many things in my head, while sighted people had systematicly to draw to understand, even for rather simple problems. My chemistry professor also had the nice idea to bring construction game to show me how atoms were linked, and it helped me a lot.
When I reach the limit of my imagination (when a problem is too complex), I'm still surprising myself moving my hands in the air... for an external person, it should sure be a bit strange and funny. Note that, at the beginning of my programming learning, I did the same when I had to imagine myself memory to understand the concept of pointers in C...
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