AN AMERICAN academic has stumped the internet with a mind boggling 'perpetual diamond' optical illusion.
The illusion shows a pink diamond in the middle of the screen that - upon first gaze - appears to be flashing and moving. His tweet read: "The Perpetual Diamond: The diamond remains fixed in one place but appears to move up, down, left or right.The post received more than 1,000 retweets and 2,100 likes and prompted some confused reaction from Twitter users.While Discodesert simply said: "The diamond is moving. You can't say it's not moving."
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