Graffiti in Oxford

In Oxford there is an impressive gallery of sophisticated graffiti. I think this kind of folk art is more important than most people think it is. It can be used for good or bad.
See here for background: https://hpanwo-voice.blogspot.com/2016/09/another-good-mural-in-oxford.html.
And: http://hpanwo-tv.blogspot.com/2013/03/non-conformist-folk-art.html.
And: https://hpanwo-voice.blogspot.com/2012/04/good-mural-in-oxford.html.
And: https://hpanwo-voice.blogspot.com/2012/04/good-mural-in-oxford.html.