Presented below is a video that was another finalist for the 2013 Best Illusion of the Year contest hosted by the Neural Correlate Society. The video shows four yellow circles spinning at the same speed around both the Roadrunner and and the very hungry Coyote. Watch what happens when the four circles spinning around the Coyote are replaced with eight. They are still moving at the same speed, but your brain perceives them to be moving much more rapidly. When four more are added, to bring the total number of circles to twelve, they seem to move at an even greater speed.
This video was created by Alan Ho and Stuart Anstis from Ambrose University College, Canada, and UC San Diego, USA.