The Mighty Optical Illusions website contains a ton of things to mess with your visual cortex, from 3D chalk drawings to impossible objects; spot-the-object games, tests, and the just plain spooky, among many other categories. Or you can just keep hitting the Random Illusion button until you lose yourself.
posted by not_on_display on Sep 8, 2008 - 8 comments

Is the dancer spinning clockwise or counterclockwise? An optical illusion. [more inside]
posted by painquale on Oct 8, 2007 - 133 comments

Your daily dose of perception-bending. Stare at the center of this video (wmv or flash) for a minute or two then look away from the screen at your surroundings. You'll experience an interesting and somewhat disconcerting effect. Not appropriate for anyone prone to headaches or seizures.
posted by brain_drain on Aug 28, 2006 - 51 comments

Mr Angry & Mrs Calm. This illusion will BLOW YOUR MIND.
posted by smackfu on Oct 25, 2005 - 42 comments

Masters of Deception "There are a number of incredible artistic works featured in Masters of Deception, which require movement to appreciate their full impact. Additionally, I had in my possession various interviews with some of the book's featured artists that I wanted to share with my readership. Unfortunately, the publisher was unwilling to produce a CD to accompany the book. I have created this web site, therefore, to augment and enhance the reader's experience by presenting those works and interviews that I could not present in book form." Al Seckel. enjoy.
posted by hortense on Aug 19, 2005 - 3 comments

Rapid Afterimage Optical Illusion
posted by srboisvert on Jun 6, 2005 - 38 comments

Red and green dots have never been so interesting. At least to a geek like me. I love it when my brain plays tricks on me.
posted by jeremy on May 21, 2004 - 33 comments

Remember the weirdness with Bush's hypnotic rainbow tie last week? Now you too can experiment with creating mesmerizing patterns on Project LITE's Moire page.
[via j-walk blog]
posted by moonbird on Apr 19, 2004 - 5 comments