Optical illusions Brain tricks

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Deane explains several optical illusions. They are brain tricks and they depend on movement, contrast, or background and foreground. • SUBSCRIBE NOW • http://www.youtube.com/subscription_c... • CONNECT WITH CURIOSITY • Facebook ➤   / curiosityshow   • Twitter ➤   / curiosityshow   • Curiosity Show ➤ www.curiosityshow.com.au

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