The movie is set in a distant time and place where just about anything can happen. The potential for amazing special effects is built into the scenario, which is always good. It gets difficult when the characters have to explain what’s about to happen in a way that is believable. Usually, it’s done with a simple analogy that the audience can relate to. “It’s like a rubber band that if you stretch it too far it’ll break!” Take the same need to explain and put it into the real world, however, and it gets even harder. Accuracy is critical, if nothing else, because a bad analogy is worse than no analogy.