Here's a short clip for you:
The original pitch was just as I explained: There's the world of storks that deliver babies, but where do they get these babies from? And my answer was obviously the clouds. And I had done some drawings of these cloud characters -- taking some photos and Photoshopping eyes and a nose in and then having some birds all flocking up to the skies. I pitched this story of a smaller gray cloud that [lived below and] made some of the dangerous babies. And I showed John [Lasseter] these images and he touched on one of them and said let's start developing this one. And that was close to a year-and-a-half ago and it's been a really interesting learning experience for me. Obviously, this is my first [short]. It really is like raising a baby. I felt very much like Gus during this thing -- making something and wanting people to like it.