Our perception of how large or small things are in the world is systematically influenced for how we perceive distance or depth. This is most famously shown by the Ponzo Illusion (discovered by Mario ...

Optical illusions have long fascinated scientists, artists, and everyday viewers. These visual puzzles can make stationary objects appear to move, straight lines look bent, or colours seem to change ...

The Best Illusion of the Year contest offers researchers, and participants, an opportunity to explore the gaps and limits of human perception. By Katrina Miller Take a look at this video of a waiting ...

Optical illusions designed to challenge perception test perspective and depth cues.

The famous Ebbinghaus illusion, named for its discoverer, the German psychologist Hermann Ebbinghaus (1850–1909). Despite appearances, the two orange circles are the same size. Have you ever looked at ...