An optical illusion is a fascinating visual trick that plays with the way our brain and eyes work together. Sometimes, what we “see” isn't really what's “there,” and that's what makes optical ...

A new optical illusion, the 'expanding hole,' tricks the brain and reflexes, causing pupil dilation as if entering a dark space. A study reveals that 86% of people perceive the illusion, with black ...

Test your vision and IQ with this mind-bending optical illusion! Can you spot the hidden owl in the shed of trees within 9 seconds? Only sharp-eyed people will succeed.

Test your vision and IQ with this optical illusion challenge! Spot all 11 hidden cats around the old lady in just 11 ...

Curious images known as optical illusions prove seeing isn't always believing. Oct. 13, 2009— -- Look at an optical illusion and you may think you're seeing things -- such as a curved line ...