The City Is Ours #2: Graffiti Removals

There are a few different types of wall paintings that we may see while walking around a city: wall murals, graffiti, throw-ups, and tags for example, but also covered-up paintings, where illegal graffiti has been painted over.

These cover-ups might give an impression of badly painted, dirty, or messy walls to the untrained eye. But if we observe them with more than just the usual attention, what else can we figure out?