I don't want the people I'm with on this journey to feel like I'm filming them all the time. I don't want them to constantly feel as though they're being watched. So I will have the camera ready at all times, but I will only film when something is really worth filming. Those are the moments when the person being filmed is usually not aware of it.

I know that sounds contradictory - you're going on a journey, but once you know who your characters are, you become more disciplined and you film less and less.

I want every scene to feel electric and I try to finish the filming period with a clear trajectory: a beginning, a middle, and hopefully an end.I hate "fly on the wall." It infers that I don't relate to the people we're with and that I don't get affected by events. I like it when people talk to me. I never say things like "Don't look at the camera" - how bossy!

There's no point in making something if you're not falling in love with the people you're filming and you want them to really enjoy you being around. It would be weird if, when you're making a film, you don't think it's going to be the best ever or the worst ever - I guess it goes from one feeling to another.

The magic of documentary is that I keep being surprised and amazed by the things I film.

Personally, I don't like watching films about victims - people where you're meant to think, 'Oh, this is terrible,' and you go home feeling really depressed.

The biggest misconception about me is perhaps that I film all the time and film everything randomly. The truth is I film very little and always when something excites me and seems to mean something for the film.