One of the things we found out as we filmed with people who dealt with chimps, and with all animals, and it's really incredible, is their levels of intelligence that we don't recognize right away.

If you're setting up lights and tripods, and you've got three assistants running around, people will want to get you out as fast as they can. But if you go the opposite way, if you make the camera the least important thing in the room, then it's different.

I think the process is one of using the camera and sound in the way a detective uses a magnifying glass: to find the clues. They're discovery devices, not performance devices - you're watching things the way a cat does. You're not judging. You're there to witness something.

I heard the new film, 'Tangerine,' was filmed entirely on iPhones. No cameras were involved!