Another element they had that I thought was especially cool was a giant robot/skeletal version of the DJ, doing the exact save movements as him. They had some sort of set up that tracked Skrillex's movements on stage, and had a giant alien looking man (and later a robot much like the FOX football one) matching his movements in real time. It created an awesome effect and was an extremely impressive use of animation:
I am not sure if he was wearing a suit/gloves that matched his movements to the animation, or if it was through technology similar to the Xbox Kinect... but regardless I was impressed. Sorry for posting so many videos.... if you can't tell I really like Skrillex.