In anything really, it's finding the reality. You can't be 'real,' but you can create a reality. And that created reality is what the audience believes in. And that's essential. Because if the audience doesn't believe that, they're never going to trust you. And if they don't trust you, you can't lead them up the mountain.

I think I'd rather do [acting] in the real place. It requires different things, working with green screen, but its an imaginative exercise anyway, the whole business of acting, so it just gives you a bit more to feed the imagination. Unless it's really silly, just two of you stuck in a space with nothing but green screen that's got to be pretty difficult.

It's amazing how quickly human beings adapt, isn't it? It was such a great crew, and David [Lynch] was wonderful to work with [on 'The Elephant Man']. It was a very thrilling time, actually.

It's quite interesting, looking back at the first one [film about Harry Potter], nobody knew whether or not it was going to be successful as a film. The books were of course already very successful, but that's happened before, where the books were successful and the films weren't at all. But it turned out that they were.

This whole theory of alienation that intellectuals have been passing on, really is just to stop a lot of ham acting. If you fill something with a proper emotion, it didn't worry him at all.

The first film is everything you want to say and how you want to say it. Lots of directors will do that and do it really well, but the second film is not so easy.

Bong Joon-ho is enormously sensitive to performance. He knows what he needs to see and that's all he needs to shoot. He is so daring. We don't do that in the west. We shoot everything.