Most optical illusions last for a few fleeting moments when you're staring at the book, screen, or whatever medium the ...

THERE is a well-known visual illusion in which a vertical line is judged as longer than a horizontal line of the same length. The illusion also holds, though attenuated, when lines are perceived ...

An optical illusion is a type of illusion that occurs in the visual system, causing something to appear that does not actually exist or that is different from reality. There are a wide variety of ...

CAMBRIDGE, Mass. -- Anyone who has seen an optical illusion can recall the quirky moment when you realize that the image being perceived is different from objective reality. Now, a team of scientists ...