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ganoncrotch said:

your brain and eyes are not to be trusted when it comes to color... or much else, a lot of what you "see" is just your brain filling in the blanks of what it thinks it should be seeing

http://upload.wikimedia.org/wikipedia/commons/6/60/Grey_square_optical_illusion.PNG in this picture the squares marked A+B are the exact same colour... there is no difference. Don't believe your eyes? or don't believe me, here is a gif of it :) no trickery, just your eyes thinking it is darker because it is in a shadow! http://upload.wikimedia.org/wikipedia/commons/9/93/Optical_illusion_greysquares.gif

Colours and shades are not too far from each other, http://upload.wikimedia.org/wikipedia/commons/2/27/ColourIllusion2.jpg the second card as in the pink one he is holding in both these pictures is the exact same shade, most peoples eyes will have a hard time seeing them the same because the surroundings are so different that your eyes just guess the last colour.

Think about it like this, you're in a club or a cinema which has dark or really colourful lights around you, you know for a fact that everything in the room is being coloured by the lights around you.... you take the white ticket from your pocket which you got outside to take a look at it... you see it as white, in a room where there is no chance that the paper should appear white to you, but your brain knows it's white.

 

You are focussed on optical illusions and light. I'm taking a crayon out of a box. In normal incandescent light, it will appear the same to everyone who can perceive color. Do you agree?