Clive [Oppenheimer] and I figured out that I'm the only one probably in the film industry who is clinically sane. I say that as a joke, but there's a grain of truth to it. I'm not a stupid daredevil who jumps into the crater of the volcano to get the closest close-up, I'm not one of those. And you have to be aware that you have a crew with you and you are responsible.

At the end [when I speak about] magma under us everywhere, how it's monumentally indifferent to scurrying roaches, recoiled reptiles, and vapid humans alike. You see, you would never hear anything like that in a National Geographic or a PBS movie. This is clearly a transgression when it comes to being politically correct with your commentary.

The wonderful thing is that Clive [Oppenheimer ] insisted on training his camera - his private camera - on me at one point. We were discussing things such as how to avoid certain dangers, while reflecting on a volcano that had threatened to explode 40 years ago.

It's very enigmatic because of course, the population [of North Korea] has no contact with the world outside or it's very, very limited. They don't have any telephone connections, no radio, no TV, no movies, no newspapers - nothing from the outside world. This is very strange and there's the very strict, unifying government that forces you to be in step. You see it in the stadium where the spectators create, by flipping cards, an image of the dear leader, or of the volcano, and it's made of a 100,000 human pictures.

The paintings are not just on flat walls - you have these enormous niches, bulges and protrusions, as well as stalactites and stalagmites. The effect of the three-dimensionality is phenomenal. It's a real drama which the artists of the time understood, and they used it for the drama of their paintings.

I run my own film school, the Rogue Film School, and I do it over three and a half days, eight hours non-stop everyday; alone, single-handedly. But the difference is in the Rogue Film School I do have real human beings in front of me from all over the world, and of course there's this course as well, they can ask, talk about their problems and obstacles, finances, anything, you just name it. Whereas in the Masterclass, you are speaking to cameras.

I think psychology and self-reflection is one of the major catastrophes of the twentieth century.