Paul Rucker writes:

In May of 2009, I was honored to be part of a Prison Issues residency at the Blue Mountain Center. While there I had the honor of being in the company of some amazing people. Artists, activist from around the world provided over two weeks of inspiration, knowledge, and camaraderie.

While doing my individual research, I happened upon some maps created by Rose Heyer that showed the growth of the US Prison system. With that information, I was inspired to create Proliferation, an animated mapping of the US Prison system set to original music.

Timeline
Green Dots: 1778-1900
Yellow Dots: 1901-1940
Orange Dots: 1941-1980
Red Dots: 1981-2005

For more information about Paul Rucker, visit his his website.