K what Im about to write think about really hard, it will change your outlook on what youve known your whole like to be true.
Alright look at a colour around you, any colour. Like say the boarder of site, its green right? Youve known it that colour to be green your entire life, you know what green looks like. Now think, what if what your eyes are showing you green, now think what if what you know the colour looks like isnt the same thing that someone elses brain is telling them green. Let me explain, like what you see and green, might look like purple to them (what you see as purple), or some colour you couldnt even begin to imagine. But you both know what green looks like to them. So both your concepts of green were differant. Now think would this also explain colour blindness, and why people have differant colour cordination.
Just think about it for awhile, let it all sink in.