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 ...

Optical illusions are designed in such a manner that they serve more than an entertainment source. These puzzles are also studied in human psychology as they reveal how the human brain works. It ...

Think you can trust your eyes? Think again. What feels undeniable at first glance is sometimes a surprise, an illusion, or an invisible trick. Ordinary images, patterns, and shapes are windows into ...

Optical illusions often go viral, but they've been around long before social media. Here are 10 historical illusions that still leave people puzzled.