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If you spent much time in Chicago’s artsier north-side enclaves, you’ve likely crossed paths with Chicago rapper Brian Wharton—he goes by Sharkula, but he’s also sometimes known as Thigahmahjiggee. And if you’ve ever talked to him, he’s inevitably tried to sell you something: a homemade CD-R, a T-shirt he’s drawn on with Sharpie markers, or (more frequently these days) a graffiti-indebted painting on canvas or a piece of cardboard.…