I spent about a year and a half doing technical post work on 'The Fountain'. Although I do like the process, I think my favorite part of filmmaking is the actors.

CGI means, just to be clear, creating any type of image with a computer. Basically, starting off with nothing, or with images and manipulating them. The way we did it, everything was actual photographed images. A lot of that stuff was shot through a microscope of chemical reactions, yeast growing, lots of weird things, by Peter Parks. We put it into a computer and collaged it, manipulated it. Meaning we digitally shaped it to fit with other images. But there was no computer-generated imagery at all.

In the story, which is only a few chapters long in Genesis, Noah never even speaks until after the flood - but when you have Russell Crowe, you're going to make him speak.

I'm Godless. I've had to make my God, and my God is narrative filmmaking

I think there's something in collaboration - the fact that you can sit there and bounce ideas off of someone. It definitely matters who the person is, because certain people... The act of collaboration, where you can talk to someone, hang out, get ideas going, there is something in that. That's similar between everyone. But I think every individual collaborator is different, because they have different brains and emotions and ways of working, so it changes. Definitely.

The only way I know as a director is to figure out what the film is about. And out of the theme and the sense of what the film is about, all those decisions start to make sense. But to find that truth within it, you have to limit your possibilities and limit your choices. That's where this visual language grows out of.

I don't make films that are easy to market, unfortunately. I think that 'Pi' was the easiest one, because we had that symbol to stick up everywhere, so that was a good gimmick, and created a good mystery, and we didn't have to do huge scale.