If you get a chance, tonight and tomorrow night at 9pm on CBC Radio 1 there is an excellent documentary on Ideas about colour and how we perceive it in our minds.

COLOUR IN THE MIND�S EYE
"If blue is your favourite colour, how do you know other people see what you see? We �see� seven major colours in the rainbow, thanks not to physics or physiology, but to Isaac Newton. Some cultures name only two colours; others, three or four. A spectrum of ideas by colour philosopher Carl Simpson."

I heard this a couple years ago and it's an excellent documentary. Go listen to it now!