I Am Love, Italian auteur Luca Guadagnino’s 2009 collaboration with Tilda Swinton, swirled in elegantly melodramatic fashion around a couture-clad matriarch slowly unraveling from the inside out. A Bigger Splash, which has nothing to do with the minimalist David Hockney painting of the same name, finds him just as obsessed with attractive surfaces, but everything else has changed (he swiped the scenario from 1969’s erotic thriller La Piscine with Alain Delon and Romy Schneider)…