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!

I watch mainly fiction. The films I like watching are films where you see people change, like with Boyhood. You see a moment in someone's life where it's a breakthrough. For me, the breakthrough in Boyhood is that amazing moment right at the end when he finds somebody he can feel relaxed with, and who will maybe be a friend for the rest of his life. I like that it doesn't end in a love affair or marriage. It just ends in, "Wow, I found people I can relate to for the first people in my life. These people accept me, I like them."

I meet all these American filmmakers that film for months and months, and it's a mystery to me. I couldn't make a film like that. I have to be very clear in what I'm doing and where it's going, and be very disciplined about what I film.

I don't make 'issue' films. I like making films about rebels or pioneers or people that are doing something.

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.

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.

It's always scary making a film as I never set anything up or ask anyone to do anything, so I worry that we'll find a story. I have to trust that a film will come out of the journey we embark on. I have many, many sleepless nights.