First let me say that I don't think that graffiti art is trash. True some of it I can't read or understand but some of it is really very creative.
Looks like that are more graffiti artist doing their thing around town. They are using the walls around Highland Park, near the site for the new fire station.
They have done a piece at the entrance of Hamtramck at Jos Campau, they have done a very nice piece at Eastern Market, along Gratiot right before the I-375 freeway entrance.

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They have done a eye catchy mural on the the wall at the Russell Industrial Center

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And, the other form of trash art, again no slight on the talent is the Heidenlberg Project, he has really made a name for himself.

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There's another artist doing simular art on Lasher at Grand River.

I guess there's no level to the talent in The Great Detroit.