"I remember exactly when I got the idea. I was standing on the set of "The Crow" and we had built this roof-top set because we didn't have a great budget we just build these one-third scale buildings that we moved around on wheels so after we did a shot, we'd move them all around so we could make the background look different so we could shoot different scenes and you wouldn't see the same building in the background all the time. I remember standing there on the set and watching these buildings just move, because you couldn't see the guys moving them, so all you could see was just the building sliding across the set. And I just remember thinking that was really cool and I'd have to use that in some way. So I stuck it into this movie."