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.

There is no glue, no cutting—only precision, patience, and a deep understanding of form.

Add Yahoo as a preferred source to see more of our stories on Google. Researchers are finding that many of them do experience these perceptual quirks, though not always in the same way. "Illusions ...

Everyone loves an optical illusion — even if they leave us completely stumped — and they're all around us in the natural world. From an underwater waterfall in the Indian Ocean to a surrealist scene ...

Take a look at these interesting images taken from confusing perspectives. Take a minute to glance at some odd, confusing ...

Most people use the terms “optical illusion” and “visual illusion” interchangeably, much like “fluid” and “liquid” or “sofa” and “couch” are synonyms. At first glance, this might be seemingly pedantic ...

Allen Institute researcher Jerome Lecoq points to one of the diagrams that was used in a study focusing on how the brain interprets optical illusions. (Allen Institute Photo / Erik Dinnel) Our brains ...

Two NASA astronauts had some fun during the ISS' capture of a robotic cargo spacecraft on April 13, pretending to hold onto ...