well, the guy is a graffiti artist to start with, so it's actually more likely it's all really painted on walls. and it definitely looks that way to me... i don't know how common graffiti art is where you live, but here it's quite common to see really quite complex, monumental stuff, some of it is amazingly well done. so it seems completely plausible to me. but if you don't have that in your cities then you might find it a bit less likely.
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