http://www.google.com/imgres?imgurl=http://kids.niehs.nih.gov/illusion/images/wheels.gif&imgrefurl=http://kids.niehs.nih.gov/illusion/illusions.htm&h=768&w=1024&sz=293&tbnid=og788mFJwbL_BM:&tbnh=113&tbnw=150&prev=/search%3Fq%3Doptical%2Billusions%26tbm%3Disch%26tbo%3Du&zoom=1&q=optical+illusions&usg=__9l6pFrwuGERLqVf4HeTiBQ4uXhU=&sa=X&ei=gVbiTeCiOYb20gHo86SmBw&ved=0CGYQ9QEwCA
U might wanna check this out
see if its moving