To view the animated demo, you need a Quicktime plugin in your browser or a Flash-capable browser.

If it works, you'll see something which looks very roughly like the picture below. The white discs are real, the dark regions are the illusions. The dark regions between the red fixation circle and the discs are the spokes illusion, the remaining dark regions are the wakes illusion.

Click here for the Quicktime version.

Click here for the Flash/Shockwave version.

To our knowledge, these illusions had not been documented before. Two papers regarding these illusions are now available.


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