I have to admit though that while enjoying the show, I'm distracted by the light-show technology. In fact every concert I see, I am just LOVING the light show.
There was a part of the show that had me wondering something: The fans at her stage were all holding what I will call light sticks, that changed colors.
I know that of course, these light sticks have multi-color LED's in them, and that each stick is addressable, so a computer + Wifi somewhere can tell each light stick to change colors.
What I don't understand though, is that in order to get patterns to appear properly, they must have also had to know where each light stick was, relative to the others.
Perhaps the designers told the fans to stay in a single position, but I don't think this is likely. I'm guessing there were 2000 fans on the floor so they must have been moving around.
So then: How did they track the position of the sticks?
The only way I can think of that they did it was that each stick had sensors in it similar to the drones in the drone show earlier. Each stick "knows" where it is by sensing each of the other sticks around it. It tells the computer "Hey! I'm at X,Y! What color should I be?". It receives its color, then tells the computer its new location again, lather, rinse repeat.
Anyone have any other ideas on how it worked?