I must say, the people who started this whole Masterclass series have been very helpful and very intelligent to point out certain things and also give me some guidance, "isn't there something missing, shouldn't we address this or that?" so it's not completely alone out of the blue. It's very well thought through.

There are photos of Kim Jong-un right up atop the volcano. I actually wrote a letter to him asking if I could speak on camera. I never got an answer. But what was interesting was the people who were responsible for us, our "guards," it took them two days to figure out how I should address him. "President? No, you can't because there's a president for eternity." And it was a time when his status was still in flux. Only a few months later there was this party congress which assigned an official title to him, but that was after we did our film.

Spirit of immersion and curiosity and awe and participation is something which Timothy Treadwell and I have in common.

Otherwise you have to repeat a lot when you're filming. And I've seen the film and it's in a border town in Mexico close to the border with the United States, so of course you have a lot of traffic and noise and dogs barking right nearby, and for that you have to repeat a lot and Robert Rodriguez didn't do that. Smart, smart, smart, you better have smarts also.

I make films because I have not learned anything else and I know I can do it to a certain degree. And it is my duty because this might be the inner chronicle of what we are. We have to articulate ourselves, otherwise we would be cows in the field.

It doesn't matter whether you shoot on celluloid or on digital, you better make a good film.

In the Chauvet Cave, there is a painting of a bison embracing the lower part of a naked female body. Why does Pablo Picasso, who had no knowledge of the Chauvet Cave, use exactly the same motif in his series of drawings of the Minotaur and the woman? Very, very strange.