Sign Choreography

We're impressed with the choreography of the various signs that are held up by the delegates during each of the speeches. I guess I thought these things just happened. In fact, the convention staff all throughout the hall roll these things out on a very tight schedule just in time for the speech during which they are to appear. They are very serious about NOT holding up a sign until its scheduled time. I can't imagine the coordination that makes all those awesome images on TV possible.