Originally Posted by: magicninjaOne that always bothered me was color perception. We've all been trained to perceive the color of GT as "Red". What if what I see as red is really what you see for green and what I see for blue is what you see for red but since we've been trained that the name for the color is red, we are in total agreement that the color is red.

Colours are different wavelengths of light, existing independantly of any observer. However we percieve a particular colour, that perception is consistent, and what you see as 'green' will also be seen as green by someone else. Things get a bit tricky in transistion areas like blue-green, but that's because some people discern small gradations in colour better than others, not because the colour they are looking at is actually different.