Came across this video on www.newscientist.com. The illusion is pretty mind-boggling. No trickery involved here.
Although both of the shapes are the same size, the one on the bottom looks bigger. The brain trick is thought to occur because the short edge of one shape is lined up against the longer side of the other. However, there is still no consensus among researchers on why our brains perceive this effect.
Cheers!
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