So the idea behind this was really just that I wanted to try something different. When I had to come up with a concept I kept imagining my hand bullying and teasing a flour sack, until finally it would fight back and defeat me. After a lot of tweaking with the story over how this "bullying" would carry out, I ended up with my final idea.
I knew I had to find a simple way to layer the animation and live action, so I thought of a green screen. The only way to get the animation right and in sync with the live action was to first get a video of my hand doing the necessary actions.
With that in mind, I constructed my own high-tech green screen.
Then I lit the area.
And then I staged my camera accordingly.
So with the video reference of my hand shot, I then removed the green screen in After Effects and replaced it with a grid. This grid was drawn out on animation paper and was always under the pages I was animating, so that way when it was put behind my hand in the computer, I would know exactly where I needed to draw the flour sack on exactly what frames the actions were taking place.
With everything tracked and animated (which took a few weeks) I then put the two layers together in After Effects, adding and subtracting frames where needed to get the final image.
Add a dash of classical music and you have Sack Attack. =-)