For our production of Urinetown, we've hung a black scrim in front of the cyc to dull it down a bit. In doing this, we've discovered a really, really cool property of scrims. When heated, by lights, they move, giving the effect of an animated cyc. We have a tower center stage on the second level, so we have hidden a vertical boom behind it with S4 pars & scrollers behind that, so that we can shine light out from behind the tower of the UGC headquarters (for those of you who know the show, that's what the tower is in our set design). Whenever the cyc pars kick on, the scrim moves all over the place. It's subtle, but absolutely amazing, and fitting with the production concept. Also, whenever we shine the cloud gobos on it, it moves, which works in our favor, or the river gobos or the zip strips that are shooting up from below. It's pretty insanely cool. Just sharing an accidental side effect that turned in to a very, very cool animation effect.