I will always have a child in me. That is what Pete Jackson has got, what a lot of the directors I have worked with have. It is about knowing how to have fun and that is something I always want to hold on to.

It's not work, it is more of a passion. It is so much fun and it is really makes you feel great at the end of the day. You feel like you are really after doing something good and you are after accomplishing something. Acting is one of these things that I can't really describe - it's just like, why do you love your mum and dad? You know, you just do.

One of the things that would steer me away from a franchise is that I'm playing the same character all the time and I wouldn't want to be known for that.

Joe Wright was almost like a teacher, to be firm with me, that really stuck with me. And that helped me as I've gotten older.

Everyone thinks I'm ethereal. But I'm not like that, you know. I'm not ethereal. Well, I might have a little bit of that quality to me, that 'old soul' thing, but I'm not ethereal.

When I was younger, I would mess about and have a laugh with everyone. I was doing Atonement when I was about 12, and as we went to do this very serious scene, the director Joe [Wright] came up to me ... I'd been giggling right up to the beginning of the take. And he came up to me and said, "Okay, you need to be serious now." I completely idolized him.

The written word can be powerful and beautiful - but films transport us to another place in a way that even the most evocative words never can.