The most interesting characters are those you're drawn to, then repelled by, and then come to understand. All that tension - I live that. But I don't plan the tension. It's just something that should happen.

My real fantasy if I was to drop out would be to live in a mobile home and be a hippie and drive around festivals and have millions of children - children with dreadlocks and nose rings - and play the flute.

Seeing someone you know be good at something is really appealing. Seeing how Darren Aronofsky behaved on set, it was another aspect of him, the director. He'd never directed me at home in the kitchen before. It was just seeing a whole other aspect of someone. It was really, really exciting. I loved it.

That was me under the bath and the water being held down. The director wanted it to look as real as possible so he told Keanu, in front of me, don't go easy on her. So it was scary.

Film is such a director's medium; you're really in their hands in terms of the real storytelling. As an actor, you can give a performance moment to moment and some of your takes will be used and some of them won't. I think there are great films you can make with bad performances, and vice versa. There are all combinations of those things. It's really down to the director what happens, I think, so that's why it's really good to work with very talented, bold directors.

You get perspective on things when you're away from your child, and in a way, your love for them becomes even deeper.

And I guess, I guess it's a humanist film. It's not really a spiritual film and it's, you know, it's saying that we're all one tribe of humans and we're on this little rock, floating through the universe and (Amenabar) has these (transitional shots of) POVs where you see humans like ants.