[on 'Kung Fu Panda 2'] We have characters who are so complicated we couldn't have done them before. The main character, Lord Shen, is insanely complicated and, technologically, we had to figure out how to make that happen. We had to figure out how to make massive numbers of characters in a shot all move believably and not have the computer explode. We had to have explosions that had to be different, instead of some Civil War kind of cannon. And on top of all that technical stuff we had to make sure we had a good story, built on characters who are solid, and follow what the character needs.
[on movie-making] There's always a danger. Every movie goes through that U-shape where you start with 'Oh that's a great idea. I love it.' Everything's possible and then you face 'Oh, we can't do that, and that's impossible, and that's a bad choice.' You go the practicality of it. And then you come up to 'Great.' But that middle part is when you don't have results yet. You just have a lot of questions.