Films don't take as long as people think. 'Harry Potter,' people always used to say, 'Well, my God, do you ever get any time to yourself?' I think I did, in 'Harry Potter,' over a 12 year period I did five days. So it's not exactly exhausting.

I think an actor is very like a sportsman. You have periods where you're in terrific form. Everything you touch seems to work, and come right. And other times, when you're working really hard, it's okay, but it isn't scintillating.

Some directors involve waiting, and if you want to work with that particular director you're going to have to hang around.

I think you can get better in mathematics on a school level, but when you're talking about being a mathematician, I think that's definitely a gift of genes or whatever.

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.

I got used to [ Lars Von Trier] doing the narration for 'Dogville' and 'Manderley.' And I said to him I do these narrations for you but you never put me in a film! So he called my bluff and put me in 'Melancholia' and I was thrilled about that.

I think it would be very difficult to play somebody if they didn't think they had any virtues or redeeming characteristics.