That is really cool. I now have this crazy idea of doing that live at a concert but on a much bigger scale. Have the flames on the back of the stage reacting to how everyone is playing.
Interesting. Check out at about 2:10 when the rock tune starts. There is a big gap on the right of the tube. When the vocals come in they fill the gap. Visually underscores leaving space in the mix for vocals to cut through everything else.