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 voilĂ , you have yourself a poster. Download it as an image or SVG file.

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Nathan Yau
http://flowingdata.com

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