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9th April 2016
11:11am BST

Marc commented in another tweet, "The lower one is *clearly* bigger than the upper one. Until it isn't." While there is obviously a scientific reason behind this optical illusion, it's still confused a lot of people with Marc's tweets exceeding 5,000 RTs and Likes. Paul Craven has shared a solution which is the 'Jastrow Illusion', which was discovered by Jastrow, an American psychologist back in 1982. He concluded that the short edge of the upper piece is compared to the long side of the lower one which gives the illusion.My toddler's train track is freaking me out right now. What is going on here?! pic.twitter.com/9o8bVWF5KO
— marc blank-settle (@MarcSettle) April 6, 2016
The basis of my logo!@Sci_Phile: "The Jastrow illusion blows my damn mind https://t.co/2MlMFnfTcY… pic.twitter.com/R6ValkCazn" @rorysutherland — Paul Craven (@CravenPartners) February 23, 2016Lead image via Twitter/marc blank-settle