"Airport City is a slippy map of airport runways and highway on/off ramps rendered using OpenStreetMap data (OSM). ...I became fascinated with the on and off ramps, in OSM, during and still following the creation of prettymaps in 2010. To see them in isolation is to see the gravitation push and pull (the wind patterns and dance moves) of the cities they make possible." Yep, still love Aaron.