At first glance it appears to be President Bill Clinton and Vice-President Al Gore, but look again!  It is really Clinton and Clinton.  Examine the faces on both men -- they are absolutely identical, only the hairline and clothing is different.
 
 

So What's Going On?

     In this particular image you were most likely fooled, if you were fooled, by its context. When your visual system looks at an image it is not so much concerned with the specific details as determining the overall meaning of the image. In this particular case, you are most likely used to such a pose with the Vice-President in the rear. Al Gore's familiar suit and hairline also contributed to the effect.

     This illusion is due to MIT's vision scientist Dr. Pawan Sinha. This web site erroneously attributed this illusion previously to Dr. Ron Rensink, but he had nothing to do with it. We sincerely apologize to Dr. Sinha for any misunderstanding that this caused.