1342
Before / after graffiti
(lemmy.sdf.org)
General rules:
Exceptions may be made at the discretion of the mods.
But there are so many people who are so confident in saying things that easily fit the definition you propose are "not art"
Just because there are many doesn't mean they are right (I don't mean to offend). Art, I believe, is not in the eye of the beholder, but in the thought of the creator.