Are square A and B the same color? They are!
This illusion, called the same color illusion, illustrates that purely human observations in science may be ambiguous or inaccurate. Even such a seemingly direct perception as relative color.
Similar illusions exist on the sky, such as the size of the Moon near the horizon, or the apparent shapes of astronomical objects. The advent of automated, reproducible, measuring devices such as CCDs have made science in general and astronomy in particular less prone to, but not free of, human-biased illusions.
Image & info via APOD
Image Credit: Edward H. Adelson
Know more:http://www.brainhq.com/brain-resources/brain-teasers/adelsons-same-color-illusion
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