Explore feasibility of mosaic markers for the map

[bobular]

Suggested by @nkittur-uga

This would provide a way to look at two (categorical) variables at once on the map. It might be information overload, maybe?

Also bear in mind that for performance reasons we have to re-implement the mosaic plot in SVG (Plotly is too slow to render 100+ markers) and there are some questions around how the x-axis would be distinguished on the non-zoomed markers. The magnified zoomed markers could have x-axis labels maybe (is there space, really?), but the regular map markers would not.

Regular visualization or full-screen