Optical illusion - Wikipedia

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Focus On: 50 Most Popular Optical Illusions: The Dress, Pareidolia, Pepper's Ghost, Gravity Hill, Zoetrope, Penrose Stairs, Body Painting, Necker Cube, Checker shadow Illusion, Moon Illusion, etc. - Kindle edition by Wikipedia

File:Optical illusion meets practical joke.gif - Wikipedia

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Optical illusion - Wikimedia Commons

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