Sorry,
@Agonum - derailing your thread.
wend, I found this quote from Bruce Swedien:
" ... I also have another problem in that I hear sounds as colors in my mind. Frequently when I'm EQing or checking the spectrum of a mix or a piece of music, if I don't see the right colors in it, I know the balance is not there."
(P.254, Mixing Engineer's Handbook, 2nd ed. , Bobby Owsinski)