"Prompted to undertake this documentation by his belief that the absurdity of this medieval concept" (Berlin Wall Art, 2009), the photographer Edward Murray has documented the Wall, mostly between East and West Berlin. Over 800 photos document the art on the Wall on May 1989 (McCormick Freedom Project, 2009).
Berlin Wall Art (2009) http://www.berlinwallart.com/webdev/gallery.html
McCormick Freedom Project (2009) Berlin Wall Links. [online] http://freedomproject.us/Post-Exchange/Article-wall_links.aspx