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At 60, Hirshman produced a piece – “Old Clown” – that, while not his own likeness as in “Self-Caricature,” was still a kind of self-caricature: one old clown to another. Hirshman, who circled back to the circus theme time and again (“Clown,” “Animal Circus,” “Circus Act,” “Two Comedians“), was paying homage to those who dedicated their lives to helping the world laugh.