An optical illusion occurs when what our eyes see is ... leading to a misinterpretation or distortion of reality. These visual puzzles are a great way to keep the grey cells ticking.

An optical illusion showed a bird hidden among tyres in a junkyard, challenging users to spot it within 4 seconds. Optical illusions are fascinating brain teasers that test our perception ...

People trained in this particular profession appear to have a 'superpower' that lets them decipher optical illusions better ...

Optical illusions have long fascinated internet users, offering a fun and engaging way to test visual perception. These brain teasers come in many forms, including age-related puzzles ...

Think you're seeing reality clearly? For a group of certain professionals, years of training have sharpened their vision so much, even optical illusions struggle to trick them. For decades ...

In particular, a distortion known as 'Thatcherization ... pages 937–942 4. There's a great optical illusions website which has a rotatable online version of the original Thatcher image 5.