Viral optical illusion shows dots that are the same color, but are perceived by the brain as four different hues. Expert explains how the Munker illusion works.
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Photos of Mind-Boggling Optical Illusions and How They Work
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Mind-boggling optical illusion tells you to stare at circles for a few seconds - Daily Star
Tricky optical illusion goes viral & leaves viewers baffled
Optical illusions asks people to pick how many colours they can
Can you find the 'C' in the newest viral illusion to baffle the
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Only 10% of people can spot the hidden number in these optical illusions