“I am not a designer,” said Isamu Noguchi in 1949, even though he was in the middle of a career designing furniture, lamps, ashtrays, a cemetery, bridge railings, parks, public spaces for skyscrapers, and groundbreaking sets for the dances of Martha Graham. He explained that design tended to imply an accommodation to “quixotic fashion,” while he saw himself, a sculptor, as dealing with “fundamental problems of form.” Using his provocative declaration as its title, the exhibition “Isamu Noguchi: ‘I Am Not a Designer’” is the first Noguchi design retrospective in nearly 25 years, and it features around 200 objects. This year also marks the 50th anniversary of his Playscapes, in Atlanta’s Piedmont Park—the only Noguchi-designed playground in America. —Peter Saenger