Is seeing really believing?

The above is taken from http://www.richrock.com/illusion.html

Are the wheels really moving or is it your eyes that are causing them to move?

Stare hard at the black centre of any circle and see what happens.

Check out following websites for some breathtaking optical illusions that will blow away your mind.

http://kids.niehs.nih.gov/illusion/illusions.htm

http://www.illusion-optical.com/

http://www.lovethosekids.com/illusions/aaillus.htm