“Graffiti Taxonomy is a project by Evan Roth aka ni9e of Graffiti Research Lab. It is a study of the styles of the alphabets used in graffiti found New York. Graffiti Taxonomy presents isolated letters from various graffiti tags, reproduced in similar scales and at close proximity.” See http://www.impactlab.com/2008/04/16/graffiti-taxonomy/ for more information.