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

Add Yahoo as a preferred source to see more of our stories on Google. Get ready to put your perception to the test! These incredible visual tricks will have you wondering what's real and what's just ...

Optical art — also known as Op art — caused what Assistant Professor of History of Art and Architecture Lindsay Caplan described as a “critical panic around art’s illusionistic quality” when it ...