Our pick of the best optical illusions of all time will leave you amazed and confused in equal measure.

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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.

A grayscale ballerina who appears to be moving. A human who can fit in a doll box. A black-and-white prism that appears to change shape when... Optical illusions are a brain feature, not a bug. Here's ...

Preface: The Formation of a Panoramaniac -- Introduction: Moving Panorama-a Missing Medium -- The Incubation Era: Antecedents and Anticipations -- Large as Life, and Moving: The Peristrephic Panorama ...

An optical illusion personality test reveals your current nervous system state by asking if you see a bird or a cage first.

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