"I felt that if the actor was really there looking into the eyes of the other actor – the human one – you would sense it ... So we actually put the characters on stilts in motion-captured grey pyjamas with these helmets and cameras they used on Avatar pointing towards their faces. It was a very odd-looking set. You would have the actor really there, you would have these guys on stilts representing Tharks and you would have people in green gimpsuits making sure they didn't fall over and hurt themselves. Some days on the shoot I sat there and thought: 'What the hell am I doing?' But man did it pay off, and if we were to shoot another one tomorrow I would do exactly the same."
- Andrew Stanton
This certainly looks closer to the latter than the former mentioned.