Figuregrounder
A figure-ground diagram poster tool by Hans Hack | @hanshack
The tool lets you create posters featuring building footprints or streets. Map data by OpenStreetMap contributors. Some nice implementations can be found here, here & here
Example 1Example 2Example Example 4
STEP 1 - Find motif
Click on the map to set the motif of your poster. Use the search or navigate by zooming and scrolling the map.

Click on the map

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