The population of Manhattan effectively doubles on workdays as people from the outer boroughs and suburbs commute onto the island.
A fascinating new visualisation from Foursquare breaks down the population shift even further (via Daily Intelligencer).
The time-lapse video shows Foursquare user check-ins by residence, food, arts & entertainment, nightlife, professional, and other categories over the course of 24 hours.
Here is the amazing Vimeo video:
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