I'm interested that one of the first messages in this thread mention the personalities of numbers. While I occasionally experience synaesthesia in a variety of ways -- usually music as shapes -- but I have, for as long as I can remember associated distinct personalities with numbers. It's hard to explain, but here are my numbers with their corresponding "personality" traits.
1 -- taciturn, solemn
2 -- carefree, a joker
3 -- sexy and mysterious
4 -- kind of dumb but pleasant
5 -- strong willed, ambitious, doesn't kid around
6 -- a party animal
7 -- shy and awkward (doesn't get along with 6 or 8)
8 -- cocky, a smooth operator
9 -- brainy, powerful yet humble
10 -- a regal figure, all the other numbers look up to 10
Is this totally insane? Or do other people have similar ways of thinking about numbers? By the way, I am not particularly good in math, any connection?