So found this photo the other day, its just an effect of the eyes but just enjoyed seeing how it worked.
http://img849.imageshack.us/img849/421/developu.jpg
So the way to do it.
/1 Stare at the red dot (the top dot) on her nose without blinking for 40seconds.
/2 look away fast at end of 40secs to a blank surface such as a white wall or ceiling.
/3 now blink your eyes rapidly
/4 enjoy what happens^^