'District 9', 'Elysium' and 'Chappie' were all born out of some visual concept first. 'Chappie' is the imagery, because I think I'm a visual person first, of this ridiculous robot character. It's much more comedy based and in an unusual setting.

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.

'District 9' was a singular anti-Apartheid metaphor, and 'Elysium' is a more general metaphor about immigration and how the First World and Third World meet. But the thing that I like the most about the metaphor is that it can be scaled to suit almost any scenario.

I don't want to make a film that offends people, but the whole world is so politically correct - I'm not going to not do something because it may be politically incorrect. At some point, the metaphors and allegories break down. They disappear, and you just have science fiction.

The fact that natural selection and evolution crafted essentially carbon and water into a mechanism that can think and be conscious means there's nothing in physics that says you cannot do that to a greater degree.

I think that 'Elysium' the movie is unrealistic, with the space station and everything. I think 'Elysium' the metaphor is completely realistic: it's exactly where we're going.

There are loads of sociopolitical, racial, class and future-planet situations that really interest me, but I'm not really interested in making a film about them in a film that feels like reality because people view that in a different way. I like using science fiction to talk about subjects through the veneer of science fiction.