Data Visualization Brainstorming

I'm going to start sketching up some ideas as I dig into the data a bit more. I do that mostly using pen and paper, so I'll take pictures and update this thread on ideas.

The issue names no files, tests, or entry points and only describes future pen-and-paper sketches. Start by reviewing the repository structure and any existing data-visualization work, then turn the sketches into a concrete implementation proposal with defined inputs, outputs, and completion criteria before coding can begin.

Written by the indexing model from the issue text.