Only Diana Vreeland could have dreamed up a spring gallery season like this: The works of two teams of collaborating brothers in two separate, unrelated exhibitions; a Japanese photographer's studies of felines that say clawing more than cloying; a celebration of Marilyn Monroe's abiding affection for Emilio Pucci; and a paisley-swathed opium den of a library in William Paley's mother's former house.