The way a child discovers the world constantly replicates the way science began. You start to notice what's around you, and you get very curious about how things work. How things interrelate. It's as simple as seeing a bug that intrigues you. You want to know where it goes at night; who its friends are; what it eats.

The filmmaking process is a very personal one to me, I mean it really is a personal kind of communication. It's not as though its a study of fear or any of that stuff.

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.

For example I don't work with William Hurt the same way that I will work with Viggo. They're different guys and they work in different ways. So a good sensitive director has his general style and technique and personality that he uses but you don't impose that on the actors.

Anybody who comes to the cinema is bringing they're whole sexual history, their literary history, their movie literacy, their culture, their language, their religion, whatever they've got. I can't possibly manipulate all of that, nor do I want to.

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.

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.