I just recently watched a documentary that I enjoyed very much, it was called The Art of Conflict . It takes a non biased look at the murals of Northern Ireland over the years and the artists. It also touches briefly on the conflict that still exists. I have photographed many of the murals while on my travels and suggest this film. It is narrated by Vince Vaughn and directed and produced by his family members. Worth a look. It is in Netflicks.