There's no question that how Johannesburg operates is what made me interested in the idea of wealth discrepancy. 'Elysium' could be a metaphor for just Jo'burg, but it's also a metaphor for the Third World and the First World. And in science fiction, separation of wealth is a really interesting idea to mess with.

There has to be the popcorn genre element, or I don't engage the same way. I like action and vehicle design and guns and computer graphics as much as I like allegory. It's a constant balancing game. I want audiences to be on this rollercoaster that fits the Hollywood mould, but I also want them to absorb my observations.

A lot of parts of L.A. are interchangeable with suburbs in Joburg. Very big, ostentatious houses with palm trees and lawns. Lawns are very important. Never underestimate lawns.

I think naturally I'm a very visual kind of person. If I wasn't in filmmaking, I'd be in something related to visuals. And I used to actually work as a visual-effects artist.

My favourite stuff is visual, and I always want to work with visual artwork. I think it depends on the person, but for me, photographs of an image of something interesting or inspiring is worth a lot more than words to me. I think every concept I've come up with and turned into films or that will be hopefully become a film comes from images first.

If it takes several billion years to develop the building blocks which you need, like RNA and DNA, and then those can build multicellular life and then multicellular life can be honed with natural selection to a point where it becomes sentient like us, then at some point that sentient being can begin to manipulate the matter around it to build better sentient life.

A lot of America is kind of done. People have been making films about it for 100 years. Everything to me feels used up. But Jo-Burg feels unbelievably inspirational to me.