It’s always interesting to think about the distinction between street art and graffiti. Graffiti makes the place uglier, street art makes it more beautiful. Graffiti makes you cringe, street art makes you think, makes you feel.
I especially like how the art here looks almost like it was written by an official town council or road pavement person. The semblance of official-ity makes it more powerful than if it were, say, “gangsta script”. It feels more authoritative.
I suppose it boils down to context-sensitivity. Understanding why people are using something, what they expect to see, and how they expect to interact with things. If you disrupt or damage that experience, you’re a cost. If you add more than you subtract, that’s art.