Back in June we spotted a video that had us flummoxed: a few round-looking shapes appear as squares in a mirror.…

Want to trip out your brain for a few minutes? Watch OK Go's new music video for their song "The Writing's on the Wall"…

NASA sees my space-time design examples, and raises the stakes with a time-space curvy-illusion that isn't an illusion…

Take a peek at Deformscape, a garden patio in San Francisco. The architectural sculpture is a practical solution to…

Look at these grey circles. They look bent, right? Like somebody put a ring in a vice and squeezed it? Actually, it's…

A lot of things can bother you while you're trying to work, but what about things that you only perceive as nagging? In …

It's disorienting to walk into a room where nothing is as it seems. Your doctor might be grimacing even though your…

The best optical illusions are often the ones we happen upon unintentionally, which is exactly what happened when…

At first glance, these brilliant photos might appear to be shaky images of a distant nebula, but that's just a clever…

This optical illusion is a fairly simple one, but it's still a very impressive effect. A triangle and some cunningly…

At first glance, this looks like a poster for Harry Potter, but is there something more going on? These posters…

Apparently this take on the Rubin's vase illusion has been bouncing around for awhile, but it's a fun visual trick.…

You've probably seen this optical illusion before, in which two lines of identical length appear to be different by…

You know that amazing Halloween costume you've been crafting for the past month? I'm sorry you wasted all that time…

Optical illusions just keep getting more extreme. We once examined an optical illusion in which a silhouetted figure…

Two tiles, seemingly different colors from one angle are actually the same color in different lighting. I don't get…

The Motion Aftereffect is an optical illusion in which stationary objects appear to be in motion if a person has just…

Imagine that you woke up to discover you had somehow shrunk to a doll's size. Would you think you were tiny...or that…

It's no David Copperfield, but in this day and age surely that's a good thing? Winner of the Best Illusion of the…

Watching a real life version of Escher's Impossible Waterfall melts my brain. The more I look at, the more confused I…