In theatre, there's the director, the writer, and below them the actor. In film, it's the actors who are most important. That goes against the grain for me. It's been amazing for me to see the self-confidence of actors who insist on having control, because it's going to be their faces 20ft high in the posters. I've been shocked by film actors - 25 and under - having such confidence and cockiness to rewrite a scene. My background is more about the director being in control. It's all about yielding. It's an oddly submissive relationship in which you're moulded, Pygmalion-style.