The Spinning Dancer is a classic example of a bistable perception illusion. These illusions present two equally valid interpretations, causing our brains to flip-flop between them.

People are in a lively debate over which way it's spinning, and suggesting some seemingly unhinged ways to get her to spin the opposite way. Seriously, you don't want to do this in a public place ...

A screen shot of an optical illusion. (Akiyoshi Kitaoka / Twitter screen shot) This mind-boggling optical illusion may baffle you, even after you learn that you didn’t see what you thought you did.

How This Illusion Makes You Think You’re Entering a Tunnel Try it out yourself, then dig into the science of why it did (or didn’t!) trick your brain.

This optical illusion is made of two rotating rings with six ovals side by side. Akiyoshi Kitaoka/Twitter The rings appear to be moving at different speeds but are actually spinning at the same pace.

This is an optical illusion sure to knock you off your high horse. An animated video of a moving pony is sparking fervent debate on social media, with viewers at war over the direction the animal ...