blelb The visual perception lab

previous spot spot 26 next spot

You can't see blelbspot 26?

Does your browser support java applets?

Did you enable java in your browsers preferences?

This applet requires Java 1.1.8.

Use your imagination to change the movement direction of both wheels, alternate between the same direction and opposing directions and make sure to observe the size illusion of the identical hubs.
Learn more about the motion illusion and size illusion.