This Java simulation is a movement-based optical illusion featuring a black-and-white-patterned circle which can be spun.  As users control the speed of rotation, the illusion of color will appear at the highest speeds.

This Java simulation is a movement-based optical illusion featuring a black and white circular pattern.  As users control the speed of rotation, the interior portions of the pattern appear to be spinning in different directions.

This Java simulation is a movement-based optical illusion featuring three green lines of varying hue which rotate within a circle.  Users can control the speed of rotation, producing illusions of stars, circles, and tic-tac-toe layouts.

This Java simulation is a movement-based optical illusion featuring three lines of color which rotate within a circle.  Users can control the speed of rotation, producing illusions of pentagons and octagons.  When spun fast enough, the lines appear to be a large square.