There are certain people that when they ask you to do a film, you just say, "Where and when?"

Very broadly speaking, you can put directors into two areas: One for whom you work, and the other with whom you work. And I prefer the latter, for obvious reasons.

Elephant Man [movie] was much more difficult physically. This had a couple of days. It was quite tricky. I had my leg strapped up behind me and I am a little older now. It was all marvelous, though. He [Bong Joon-ho] is one of the most fabulous directors in the world.

I think particularly Daniel [Radcliffe], he knows what he's doing. I'm sure he'll finish up a producer. He really realized what it was, knew the size of it. And it was gigantic, the biggest franchise [Harry Potter] in history.

There is always a better choice that you were unable to quite touch with a single stroke. Even in acting, there comes a point, like a painting, where you have to say, "That's it. I can't go any further with it." And sometimes, you say, "I'm really pleased that that's where it's finished up." Other times, you think, "I don't think I really quite got there, but I haven't got time to go any further." Rather reluctantly, you have to say "That's it."

I'm really the addition of other peoples' imagination, quite honestly. It's what they see me as, and I'm very happy to comply. I find things are more varied that way.

On the other hand, you get other films that are spread over a much longer period of time and it's entirely exhausting. But there's always light at the end of the tunnel with a film.