Knowledge

Facts, science and history of optical illusions.
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What Optical Illusions Reveal about You

Blueberries

Source/credit: Akiyoshi Kitaoka

Our brains understand that the strawberries in this image are red. It takes into account the blue lighting in the scene. However, if you examine this image with a color picker or as an artist, you will not find a single red pixel in this image. The phenomenon is called color constancy.