While new optical illusions go viral all the time, here are some of the most famous illusions that have kept us scratching our heads for years.

Printing is believing.

Add Yahoo as a preferred source to see more of our stories on Google. Optical illusions come in many different forms, from the perplexing to the mind-melting, but op art doesn't always have to be ...

In this video, I explore my fascination with magic and optical illusions by building five furniture chair optical illusions. Each design is revealed with a detailed explanation of how they work.

Medical imaging experts are adept at solving common optical illusions, according to new research. The research is the first to show that people can be trained to do better at solving visual illusions, ...