Optical Illusion: Only A True Genius Can Spot The Koala Hidden Among The Bears In 9 Second

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Optical illusions arise when our minds trick us into believing that objects that are not there actually exist. And this phenomenon is entirely related to evolution.  

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But why does this fraud happen? In order to survive, the brain must react quickly, analyzing incoming information and putting disparate pieces of information together.   

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Amazingly, the brain achieves this by utilizing color, patterns, and the relationship between light and shadow. Why not use this challenging brainteaser to test your visual acuity and find out how sharp your eyes really are?  

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Historically, optical illusions have been around since the time of ancient Greece and have had a significant impact on history. This technique was applied to temple roofing by the ancient Greeks, who were fascinated with symmetry and straight lines.  

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They produced the appearance of curved surfaces by using slanted angles. However, this visual trickery dates back further.  

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The Greek philosopher Epicharmus postulated in 5 B.C. that visual illusions are misinterpreted by our senses rather than our thoughts. In the meantime, Protagoras maintained that our bodily senses' interpretation of information is greatly influenced by our surroundings.  

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