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http://health.yahoo.com/featured/46/8-mind-boggling-optical-illusions/

Test your perception with these wild designs

By Olivia Putnal

If you’ve ever felt like you go a little cross-eyed after taking a peek at an optical illusion, then you know they can be a pretty intense phenomenon. What your eyes perceive when looking at one of these images is actually a visual illusion; you see the image as something different than what it is because the different cells and receptors in your eyes distinguish images and colors at dissimilar speeds. The eye can only receive a limited amount of visual stimuli, but as your brain constantly processes the visual information, it gives you the illusion of continuous sight. Whether it’s an optical, physiological or cognitive illusion, the design plays a trick on your eyes (and mind). Check out some of the interesting illusions below—but beware, you may not be able to absorb them all in one sitting.

Flowing Leaves

 

 

 

 

The brown leaf shapes against a green background make this look as if the entire group is flowing—making waves if you focus on the picture as a whole. Photo from Flickr

Pulsing Vortex

 

 

 

 

If you stare at this one long enough you’ll notice a fast and pulsing multicolored vortex. Photo from Flickr

Waves

 

 

 

The blue almond-shaped objects look as if they’re all passing over three separate columns. Photo from Flickr

Hypnosis

 

 

 

Although this image is comprised of simple purple and green squares outlined in black, it looks like it is bulging out in the center. Photo from Flickr

Kaleidoscopes

 

 

 

A collection of black, blue, green and white shapes appears to be five different kaleidoscope-type figures—each swirling toward their centers. Photo from Flickr

Wormhole

 

 

 

The black and white circular lines make this illusion seem as if there are various depths in the image, creating different entryways and tunnels. Photo courtesy of Paco Calvino

Bull’s-Eye

 

 

 

If you stare at the center of the image, it looks as if the outer rings are rotating in alternating directions—an effect meant to mesmerize the viewer. Photo courtesy of Todd A. Carpenter

Starbursts

 

 

 

These bright purple and green star-like shapes appear to be moving, which can be a little nauseating if you stare at it for too long. Photo courtesy of Angie Armstrong

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Additional Link

Cynosure-optical illusion and hours of fun!

http://www.ritsumei.ac.jp/~akitaoka/index-e.html

It is a great work by Akiyoshi KITAOKA, Professor, Department of Psychology, Ritsumeikan University, Kyoto, Japan. He explains by means of hundreds of colourful art works, how a human mind perceives an optical illusion.

"Rotating snakes"

 

 

 

Circular snakes appear to rotate 'spontaneously'.

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