<p>The population of Manhattan effectively doubles on workdays as people from the outer boroughs and suburbs commute onto the island.</p><p>A fascinating new visualization from Foursquare breaks down the population shift even further (via Daily Intelligencer).</p><p>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.</p><p>Here is the amazing Vimeo video:</p><p><a href="http://www.businessinsider.com/time-lapse-of-nyc-foursquare-check-ins-2013-9">Keep reading...</a></p>