Quote (omghacks2 @ Jun 19 2012 12:31pm)
Its very easy, the trick is in the paint. It changes color with light.
Theres nothing magical about it, theres even people that use this kind of painting in houses and stuff.
Negative.
This is your brain at play.
It's literally being fooled by the shadowing of the object and the surrounding stimuli and is over compensating for what it thinks it should be seeing given the circumstance.

If you don't believe me, open this picture in paint and copy the color from B. Then apply that color next to A and you will see that they are the same color.