I have not seen a film as powerful, surreal, and frightening in at least a decade unprecedented in the history of cinema.

There is a fascination about crime, which is understandable, but hardly anyone talks about the families of victims of violent crime and the devastation that is beyond the victim alone.

There are specific times where film noir is a natural concomitant of the mood. When there's insecurity, collapse of financial systems - that's where film noir always hits fertile ground.

You are confronted with abysses of time that are, in a way, unfathomable. You see a painting in charcoal of raindeer and it was left unfinished and somebody else finished it. But through radio carbon dating we know that the next one completed the painting 5,000 years later. You're just blown away by the notion of passage of time. We have no relationship to that kind of depth of time.

Very often, footage that you have shot develops its own dynamic, it's own life, that is totally unexpected, and moves away from you're original intentions. And you have to acknowledge, yes, there is a child growing and developing and moving in a direction that isn't expected-accept it as it is and let it develop its own life.

We were very, very lucky [with Tim White filmed making historic discoveries in the East African Rift ] . In 100 years, only three skeletal remains [of early man] were ever found at this site. This was the third one, and we were right there when it happened. In fact, when I first heard they had found something, I said, "Please stop it! Don't do anything right now. Let's do it tomorrow until we have unpacked our cameras and assembled our stuff.

Otherwise [digital revolution] hasn't changed my way of filmmaking, I'm not nostalgic in postulating we should still make films on celluloid. I love celluloid but I don't need to continue on celluloid.