I was a street kid, basically. But really, Mexico City has always been this big, complex monster of a city that has always had real problems and needs, and I've always found my way through it in different ways.

My country has been wracked with violence for a long time. Just to see all the violence on the news makes you sick. It's true that violence is in our nature, but I try to explore deeply where it comes from and where it goes and what it creates. Not in a moralistic or preachy way, but just to observe the real consequences of violence in a human being or in a society.

I was a street kid, basically. But really, Mexico City has always been this big, complex monster of a city that has always had real problems and needs, and I've always found my way through it in different ways.

The actors make the film. They're the ones that take this theoretical movie that's in your head and make it real. The success of a film is entirely on their shoulders. I admire them, because acting is such a difficult thing to do, and I personally can't understand it.

Actually, when I think about growing up, I feel most affected by two travels that I made working in cargo boats when I was 16 and 18. One of them crossed through the Mississippi and Baton Rouge and Mobile, Alabama, and another went all the way to Europe. On the last trip, I stayed in Europe for one year with $1,000, working everywhere I could, doing everything. Those years shaped me a lot and taught me the value of exploring different things.

I was aware of the possible biases you could get as a commercial director, like being too concerned about the technical aspects of the form rather than anything of substance. If you keep working in commercials, you can get trapped in a very superficial way of thinking. I always used commercials as an exercise for filmmaking, like going to the gym.

For me, it's not about masochism to talk about death. For me, it's about observing life through death, from the last point of it.