Train teaser: Why do these identical tracks appear to be different sizes? [video]

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As if spending hours playing, reading, and watching “Thomas the Train” doesn’t do enough damage to the adult brain, BBC Academy trainer Marc Blank-Settle was sure he’d finally gone over the edge when he spotted this optical illusion sitting on the floor. When stacked on top of one another, the pieces are identical, but when put side by side, they appear completely different.

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