ArtCodeData

At first glance, it might look like a metro for some city you're not familiar with, perhaps Berlin or Beijing, but this map is actually a combination of almost all those cities that might come to mind. Titled The World Metro Map, it's a mashup of 214 subway systems, totaling 791 lines and 11,924 stations (h/t Cool Hunting). New York-based collective ArtCodeData teamed up with non-profit Open Access to create the map as a representation of "human mobility" explored through the unifying element of subways. The result is a "digital collage" that's colorful, geometric, and provides a new view of world transportation.
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