Graffiti Metamorphosis of Buildings

I've seen a few buildings, usually abandoned or derelict, decorated with graffiti in a way that really works. Like this one. It's not randomly spray painted with personal tags or art. It was intentionally painted with a plan, and its beautiful. I've been reading a little about graffiti. Originally connected with hip hop music, now its standing on its own as an art form. Sometimes political, some still about music, and some just completely eye catching and turning plain into magical.