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Optical Illusion #2 (Gradient Illusion)

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Greg
Wittmann
Explanation by livescience.com: "The brain interprets the two ends of the bar as being under different illuminations, and deduces what it thinks the bar's true shading would be (if it were lit evenly along its length). It deduces that the left end of the bar is a light gray object in dim lighting. The right end looks like a darker object that is well-lit."
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