The Optical Illusion Challenge

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Which of the orange circles is larger?

A
B
They are the same size

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Interesting fact:

It was cheeky Aristotle who came up with the first recorded illusion – he crossed two fingers and used the two fingertips to touch an object. It feels like you’re touching two objects instead of one! Incredible to think he came up with that 2000 years ago and it still works today.