This Optical Illusion Is Melting My Brain

Two tiles, seemingly different colors from one angle are actually the same color in different lighting. I don't get it at all. What's the trickery here? Is it the shadowplay? The lights? The tiles? I don't know.

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It's MIT's Edward H. Adelson's checker shadow illusion recreated in real life. Viewing the two tiles without the surrounding context would reveal that the two tiles actually are the same color. Nuts. [BrussPup via The Daily What


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DISCUSSION

My brother and his wife used a variety of this illusion in their house. They have an oddly shaped living room, and they painted different parts of the walls with different shades of pain. Because of the way the light fills the room, all the walls look exactly the same, but if you go to each one with a flashlight you can see that they are different.