The Way We See Things frames our world! We can see the graffiti as art for sure, someone spent time and effort to make it happen, they cared about it. Not just that, but also the practice and experience where they honed their skill. There are people who just spray paint, and there are artists.

I just posted some of my thoughts on color, light, purple, and how we actually see things, that I think you might find interesting :

https://steemit.com/art/@theinternet/purple

https://steemit.com/art/@theinternet/purple-part-two