11 is the King: You look at the cross, but allow your brain to see the photos on either side your peripheral vision. The right eye will see the right photo and the left eye will see the left photo. The brain doesn't know how to split them up, so it merges them together. Making the faces look melted and oily. it looks like a freaking Picasso with oil on canvas. My mother couldn't see it. So, not everybody can. But, go try again.