The artist, Jer Thorp, has a blog post describing the algorithm. He started with a clustering algorithm then wrote a tool in Processing to review the adjacencie

The artist, Jer Thorp, has a blog post describing the algorithm. He started with a clustering algorithm then wrote a tool in Processing to review the adjacencies by hand. http://blog.blprnt.com/blog/blprnt/all-the-names http://blog.blprnt.com/blog/blprnt/all-the-names