Image: Fathom Information Design/Fathom.com

The earth’s population recently passed the 7 billion mark. If that’s hard to picture, this map called Dencity, composed by Fathom Information Design, may help by depicting population density using circles of different color and size. It also highlights the 20 largest cities in the world, only one of which is in the U.S. See a full-size version of Dencity.