I've been joking that if Madonna taught us anything, you've got to reinvent yourself. I think it's important as a filmmaker, as any person working in the arts, that you've got to try new stuff and challenge yourself and take chances. I've tried to take a chance with every film I've done - I've never done it the easy way, and I think that's because that's what excites me, is making as big a mountain as I can in front of me, and just trying to mount it.

I'm not a comic book guy at all.

I feel that so many sci-fi films and films in general have just become really dependent on and addicted to CGI, and that some of the big CGI films of the summer, you see these effects that look like crap. You don't know if you're watching a cartoon or something that's real. And I didn't want to fall into that trap. I really thought there was a way to use a lot of these old techniques to do some new and really neat stuff.

Film is a great tool to play with time, going back and forth through time, or speeding time up and slowing it down and do stuff like that. That's something you can't experience in real life that you can experience on film, and it takes you to a different place.

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.

When I go to movies I generally want to be taken to another world.

To me, watching a movie is like going to an amusement park. My worst fear is making a film that people don't think is a good ride.