I sketched this a few months back at a friend's place. It was inspired by the movie
Up by Pixar, which may or may not of been obvious from, you know, that bundle of balloons there.
Believe it or not, I question the physics of that movie. Ah well, I'm sure it's scientifically sound and I'm just being paranoid. It was made by Pixar, after all, they are nothing if not sticklers for scientific logic.