Ostlund, whose art-world send-up “The Square” took the Palme in 2017, pulled off the rare feat of winning Cannes' top award for back-to-back films. CANNES, France (AP) - Swedish director Ruben Ostlund's class warfare comedy “Triangle of Sadness” won the Palme d'Or at the 75th Cannes Film Festival on Saturday, giving Ostlund one of cinema's most prestigious prizes for the second time.