Okay sweet. I set up a new repository just because it was the easiest thing to do, and we can edit this file directly on GitHub: https://github.com/fitze/pydy-viz-sketching/blob/master/visualization.py

Go to town. Just click Edit! Put in lots of comments! It might be that it makes sense for one of you to own this file, but that would require that you make us collaborators directly on your project (I just want it to be super easy to edit this file together; no pull requests for the sketching)