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There are a variety of learnings as we go. Of course don't forget to have a look at the issues also!

1. We probably don't need d3 (or snap), but these would perhaps be nice
2. Mike Bostok made a simple line drawing widget.
3. Need to figure out how to do pointer event handling with access to all SVG elements. See MDN docs and also this idea for using closures.
4. Once we have control of things, we will probably also want to do full screen.
5. Lastly, we'll want to figure out the use of touch events.