Racial Dot Map

Created by Dustin Cable at the University of Virginia's Weldon Cooper Center for Public Service, the Racial Dot Map provides "an accessible visualization of geographic distribution, population density, and racial diversity of the American people in every neighborhood in the entire country." As such, it displays over 308 million dots, color-coded by race, for each person residing in the United States at the time of the 2010 Census.

More information:
http://demographics.coopercenter.org/DotMap/index.html