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Shows on Diego Rivera and colonial prints tell a deep story

San Francisco —  The year was 1932. The setting, a hall occupied by the Philadelphia Grand Opera. The event: a ballet titled “H.P.” for “Horsepower,” a dance that hasn’t been replicated since — probably for good reason. “H.P.” featured an array of agricultural products (bananas, tobacco) dancing onstage with a company of sailors, a siren and …