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Optical Illusion: 'Four Perfectly Round Circles'

Counting down to quittin' time on a Friday can grow mind-numbing when you have only the whole of human knowledge at your fingertips. To help inject a little frivolity -- and break up those end-of-the-week doldrums -- we bring you a favorite Switched pastime: getting those synapses and neural circuits firing with an awesome optical illusion.

Although this latest offering may not be quite as mystifying or mind-blowing as the rotating naked lady, the Ames' window, or the curveball demonstration, 'Four Perfectly Round Circles' has already received almost 5,000 diggs. It may appear to be a small circle surrounded by a spiraling line, but the image actually depicts four circles, which, if you trace their outlines, are indeed perfectly round and do not interlock.

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Audio/Video, Web

Ames's Window Optical Illusion Will Blow Your Mind

Need something of an eye-opener on a dreary Wednesday afternoon? Check out the above video demonstration of the Ames window, a compelling optical illusion featuring a trapezoidal window with an angled bar bisecting it as a sort of reference point. As the odd-shaped window rotates, the bar occasionally, and magically, appears to pass right through the frame while the window seems to reverse its rotation.

The illusion was created by American scientist Adelbert Ames, Jr., a researcher at the Dartmouth Eye Institute and creator of a number of mind-bending visual tricks like this. This window is his most mind-warping illusion, and it's easy to see why. Despite how it appears to the eye, the frame is always physically rotating in one direction -- it's just the mind that gets confused by its shape. Now, feel free to go ahead and get another cup of coffee after watching this a few times. Or several more cups of coffee after watching these, too. [From: YouTube, via Kottke.org]

3 More Optical Illusions You Just Gotta See



We here at Switched have found some great optical illusions online in the past. We are always on the lookout for more, so we were delighted when we came across these three illusions below, thanks to Inside Science News. Just last weekend, these three illusions were chosen as the world's best at a gathering of neuroscientists and psychologists in Naples, Florida. Enjoy!

1. Jerky Curveball - The title says it all. Do this one in two stages. First, stare directly at the spinning ball. On the next pass, try concentrating on the little blue dot to the right of the screen. You will understand immediately how and why this illusion got its name. Pretty trippy.

2. Colored Dove - This one didn't particularly do it for us, but the boys and girls down in Naples thought highly enough of it to rank it number two. Simply stare at the black dot in the middle of the white dove and wait for the red flash. The dove remains colored after the flash thanks to your eyes retaining an afterimage. Interesting? No Doubt. Number two? We have our reservations...

3. Sex Illusion- Sit back, relax, and get your mind out of the gutter. This simple illusion, courtesy of Richard Russell of Harvard University, consists of two pictures of the same person's face. However, each photo has been digitally altered by adjusting the light and dark places in the image, which makes one face look like a boy's and the other a girl's. It's a great effect, and it provides a succinct little study into gender perception. Isn't learning fun? [From: Inside Science News Service, via Livescience]

Computers, Top Lists, Slideshows

Top 25 Optical Illusions on the Web



Most of you have looked and/or fretted over optical illusions at some point in your life. A select few have even had a sleepless night over particularly difficult ones. They come in all shapes and sizes and colors. Double meanings, motion-induced blindness, and mind bending perspective distortion just to name a few. Here, we have compiled a list of some of our favorite illusions on the Web. Some are simple and thought provoking. Others, well, they just make you thankful that you are sitting down. Now take a break and blow your mind.

Audio/Video, Computers, Editor's Picks, Slideshows, Featured Stories

The Trippiest Optical Illusions on the Net!

Instant Test: Are You Creative or Logical?

This silhouette wins the award for coolest thing we've seen all day -- and it's not just because the tiny dancer above is in the buff. This is a little test that will tell you whether the left or right hemisphere of your brain is more dominant.

Instead of concentrating on her chest, concentrate on the woman's movement. If you see her spinning clockwise, that means you're using the right side, or more creative side of your brain. If she appears to be moving counter-clockwise, then that means the left side, or more logical side of your think muscle is superior.

At the Switched office, some of us see her going clockwise, others see her spinning counter-clockwise. At least one of us claims to see both, while another one of us opened this animation in Adobe ImageReady in order to isolate the frames to see if there's any direction-changing funny business going on. There isn't.

Take the test for yourself. Then, if you have time for a 50-question survey, compare these instant results to a more thorough diagnosis.

From Gizmo Watch

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