In visual perception, a figure-ground grouping is where you recognize an object through the background. Think of the vase and two faces image. Hans Hack made a simple tool that lets you make such a diagram using OpenStreetMap data. Select a location in the world, adjust the radius of the circle, provide a label, and voilà, you have yourself a poster. Download it as an image or SVG file.
Make a figure-ground diagram using OpenStreetMap data
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Mapping the Most Common Races
Select one or more races for a quick comparison. Counties are colored by the most prevalent.