Growing up the son of a director has made me very aware of the various turns that a directing career can take. Sometimes your films turn out exactly as you want. Sometimes they don't. I spent a lot of my childhood on sets. I think as a joke, my father gave me a line of dialogue in each of his films during the worst moments of my puberty.

Growing up sucks, doesn't it? I understand why people wouldn't want to get old - but it'd be one thing if we became a culture obsessed with eating right, doing yoga, going to therapy and becoming at one with ourselves. That be great. But we don't do that. We seem to be obsessed with all the wrong ways to stay young.

Alien' asked ground-breaking questions about eco-politics and female empowerment. 'The Matrix' delved deeper into the concept of perception versus reality than perhaps any other film I know. But for some reason, we tend not to remember the significance of their writing.

I'm not going to have a perfect career. It's better to be Billy Wilder and make lots of movies and have five or six great ones than to make so few movies that when you make a bad one it crushes you.

People have these incredible expectations. So instead of being inspired by, say, Joni Mitchell's music, I look at it and say to myself, 'I'm going to quit - why would I think of writing or performing after listening to that?'

The struggle for Zimbabwe lit up the imagination of people around the world. In London, New York, Accra and Lagos, bell-bottomed men and women with big hair and towering platform shoes sang the dream of Zimbabwe in the words of the eponymous song by Bob Marley: Every man has the right to decide his own destiny.

Yes, I do bring something of my own to the plate. But I strongly believe that a film is a director and writer's vision.

The medium of film is really wonderful because it can behave in the same way as collage and painting; it can be layered and non-literal.