This brain-frazzling optical illusion is enough to put your head into a spin. The purple-and-yellow image looks as though it’s both three-dimensional and moving but is in fact stationary and flat.

A viral optical illusion featuring a horse reveals insights into your personality based on perceived movement. Seeing the horse move away suggests a hopeful, future-oriented mindset, while ...

Optical Illusions: The Best Illusion of the Year Contest offers researchers, and participants, an opportunity to explore the gaps and limits of human perception.

Now you can, thanks to this wild, but simple, optical illusion. Just start the video below, watch the spiral for 30 seconds, and then shift your gaze to the painting below.

Optical illusion personality tests, popular on social media, use images to reveal if individuals are optimistic or pessimistic. A key example asks if a horse appears to move forward or backward ...