Seeing color is a matter of perception. We see blue because of the way certain wavelengths stimulate cones in the retina. You see color with your brain. You probably think your tongue is pink, but pink isn't a real color idiot.
What was the purpose of explaining something to me I already know and clearly you didn't understand the reason you received that type of reply from me in the first place. Otherwise I would have got a actual response. So I guess the definition of an idiot would be you.........yourself.