While new optical illusions go viral all the time, here are some of the most famous illusions that have kept us scratching our heads for years.

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The snap change is one of the most visual card illusions in magic - a move so fast and so clean that it can look like editing ...

Optical illusions have fascinated people for centuries. They play tricks on our eyes and brains, making us see things that aren’t really there. Sometimes, a static image can appear to move, or colours ...