The last 50 or so years has seen a succession of cheeky artists who twit the preciousness of art, from Andy Warhol to Jeff Koons. Alejandro Diaz belongs in that category. His show, “RISD Business: Sassy Signs and Sculptures by Alejandro Diaz” at Rhode Island School of Design’s Museum of Art, is a laugh and a half. It’s also sometimes poignant, and occasionally problematic.
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