Why Our Brains Are Fooled by Illusions

The short answer is that our brains are programmed to see the world in three dimensions instead of two. There are more details at Discover magazine, as well as a gallery of colorful optical illusions. For example, these two Rubik's cubes do NOT have the same colors. The "blue" squares in the left picture and the "yellow" squares in the right picture are gray.

I took samples from each and put them on a white field to make sure. Link

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Using pixie.exe, one can tell these "gray" squares are not completely gray. They are blue-gray, or yellow-gray. Very few of the pixels are actually gray; the majority of these surfaces are blue- or yellow-tinted.

Again, it's pixie.exe
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I would like to make a comment on the last example in the linked gallery.
As I am red-green colourblind, I cannot with all my imagination see the "green" and "orange" squares; they look the exact same in the "before" and "after" pictures.

Any other colourblinds have the same experience?
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