Illusions

For three days in a row (thanks, Patsy) I have spent ten or more minutes studying these twelve -- or is it thirteen -- little people, trying to figure it out. And I cannot. So tell. What is going on??

I didn't figure it out but a guy at work did. I'll share his explanation in a few days.

Rob never did solve this. His IT guy at work did. His explanation follows:

"I had to print it out and cut the picture along the break lines in the 12 man version. When you do that and number the upper and lower body parts, pay particular attention to the 7 upper body parts of the top right block of guys that move. You will see that 7 upper bodies join with only 6 lower bodies, which gives you the extra man. Basically, all 12 guys donate 1/12th of their body to create the extra man, which you can see by some guys losing their pieces of their bodies, but not getting them replaced in the move. The most obvious is the guy on the bottom left that loses part of his hair, but doesn’t get it replaced in the swap. Also, a few lose the bottoms of their feet, and one guy loses his long shorts, but after the swap nobody else gets long shorts back (it was donated to the 13th guy)."