We always try to make the very best movie when we're working on and we can only think one at a time. We want to make this a perfect jewel, and then we'll see what happens after that.

If you have a movie that doesn't strive to go to a certain emotional point, you can do anything and it will be fine and funny. But if you have something pretty emotional at its core, you have to make it right. You don't want it overwrought or unearned. Everything has to be moving towards this one thing.

You're right, we both have been working on these films [Kung Fu Panda] forever and we know these characters so well that literally we will react to the same note in the same way. We will have the same answer most of the time.

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.

We have those new environments [during Kung Fu Panda 3] that give a scale to the movie, that are the spirit realm and the panda village. The spirit realm, having no gravity, having this massive space, allowed us to do huge action shots. All that we just couldn't do before. We just couldn't get the scale, we'd have to cheat them. This time we found ourselves more free.

I think we had to push forward to make sure it was different, do something that we had never done before and yet still have the consistency to stay in the same world. This was our chance to do all the things we didn't get a chance to do before. We've been working on these movies [Kung Fu Panda] for twelve years and we have to keep things exciting for us in order for us to devote that many years of our lives to do this.

You have to make sure that people are still motivated and happy and creatively challenged so that it can all be stitched together. The voice acting starts after a lot of the storyboards are done.