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.