That's a very neat puzzle. I spent a long time staring at that picture... it seems that somehow they turned 12 guys into 13 by making each guy a bit shorter and shifting the sections cleverly to make up an extra guys using the shortened pieces to form a complete man. I'll have to stare at it some more to figure out exactly - it's very interesting!
By the way, clicking on the link didn't work. I had to copy and paste the url to get it to work.