Complementary colors

Complementary colors

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If we stare for about fifteen or twenty seconds at the center of the yellow circle and then look at the black spot of the central gray area, we will see its complementary illusory blue. In the same way you can repeat the experience with the blue circle.


It is the so-called post-image phenomenon that is produced by images that we continue to see after looking away from well-lit areas. In postimagens, the photosensitive cells affected by the wavelengths corresponding to the colors impressed on the retina remain inactive. During its recovery in a few seconds, when looking at a neutral zone, the lack of impressed color is now shown as its complement.