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Disappearing Circle


Previous Illusion

Stare at the middle dot and watch the blue circle disappear!
Image created by Mysid, from Wikimedia Commons.

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An optical illusion happens because the different parts of the eye process images and colours at different speeds, this sometimes means that false images are sent to the brain. The brain receives this information but actually, the eye only sees some visual information at any given time, and our brain processes this and fills in the gaps to give the impression of continuous movement. This is highlighted in a television which actually shows a different image 25 times a second but our brain doesn't see the changes.

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