I'm just observing the world. I was born into it, like you were, and then I found out there were some really disturbing aspects to being alive, like the fact that you weren't going to be alive forever - that bothered me.

I have no rules. For me, it's a full, full experience to make a movie. It takes a lot of time, and I want there to be a lot of stuff in it. You're looking for every shot in the movie to have resonance and want it to be something you can see a second time, and then I'd like it to be something you can see 10 years later, and it becomes a different movie, because you're a different person. So that means I want it to be deep, not in a pretentious way, but I guess I can say I am pretentious in that I pretend. I have aspirations that the movie should trigger off a lot of complex responses.

The process of making a movie has expanded in terms of effort and time for the director, doing commentaries for the DVD for example, finishing deleted scenes so they could be on the DVD, and doing things like a web blog.

My understanding of life is very existential. I think that we are our bodies. There's nothing else, and when we die, that's it. No afterlife.

For me, it's just a normal artistic endeavour to explore the dark side. Certainly, I'm not alone in it. Artists generally don't like to accept the version of reality that society and culture hand them. They want to know what's really going on. So you're always looking in the ceilings, under the floorboards and behind the walls, trying to find the mechanisms, the structures, and the truth. I find that often leads you into some dark places.

If the audience lets that stuff wash over them, you know - almost like music, rather than dialogue - and doesn't fight it, then they'll have a much easier time rather than being sort of frustrated and confused otherwise. But if you get in the right state of mind it really does work quite well.

It was apparent to me that religion was an invented thing, a wish-fulfillment thing, a fantasy thing. It was much more real, dangerous, to accept that mortality was the end for you as an individual. As an atheist, I don't believe in an afterlife, so if you're thinking of murder, if your subject is murder, then that's a physical act of absolute destruction because you're ending something, a body, that is unique. That person never existed before, will never exist again, will not be karmically recycled, will not go to heaven, therefore I take it seriously.