By Jo Tweedy For Mailonline. An optical illusion that deceives the eye into thinking two cubes are rotating quickly - when actually they're perfectly static - is baffling those who've seen it. At first glance, the gif, created and shared on Twitter by Japanese user jagarikin , appears to simply be two blue cubed frames in motion, with the background flashing between black and white. Occasionally, they appear to change direction. However, focusing an eye on just a corner of one of the cubes reveals the reality - that they're not actually moving at all. It's all about the background: the illusion relies on the 'reverse phi illusion' to make the cubes appear animated. When the background flashes between black and white, the brain is tricked into seeing movement when there isn't any. The illusion makes the brain think that the still images are animated.
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