Most people are convinced they see the world exactly as it is, until a viral illusion quietly proves otherwise. The latest circle-filled puzzle racing around social feeds is a reminder that even ...

Duping a guppy is easier than duping a ring dove — at least when it comes to a classic optical illusion. In the Ebbinghaus illusion, two identical circles placed side by side are each framed by a set ...

Optical illusions are not just puzzles that entertain, but also a fun and fascinating way to test our cognitive ability and attention. Here's the latest challenge for you! This time it is an optical ...

The church of Saint Ignatius in Rome (or San Ignazio) has become a viral selfie location. Tourists have been queuing out the doors for a chance to take a selfie in a mirror that reflects the church's ...

The “IllusionCAPTCHA” test takes an AI-generated image and alters it by incorporating an illusory word or object, such as an apple. AI bots are unable to recognize it. Researchers have developed a new ...

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