This Optical Illusion Is Melting My Brain

Two tiles, seemingly different colours from one angle are actually the same colour 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.

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 colour. Nuts. [BrussPup via The Daily What

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