This was designed to be looped, so give it a few watches to absorb the full effect.
Here's a peek at my process. Sketching and storyboarding, and more sketching.
Here's the first run-through. This was my very first motion project, and as you can see, I did not end up following my storyboard very well. I think as I worked through the actual animations, my initial vision needed to be expanded. Even the difference between this first comp and the final comp is pretty big. The final version is the video at the top of this post.