AMAZING: South Korean Schools Create Human LCDs!

I'm still not sure how they do it, but in South Korea, school boys who are cheering for their soccer teams do so in a very interesting way: by creating what appears to be a human LCD screen displaying messages to cheer their team along. Apparently they do this by wearing multi-colored jackets (one color on the back, one on front and another on the inside) ans sometimes even incorporating their pants into the equation.

Here it is:



My biggest question: "How do they choreograph these things?"