qnli question: In what year did Rosenberg exhibit Cubist works at  Galerie de l’Effort Moderne? sentence: Attempts were made by Louis Vauxcelles to claim that Cubism was dead, but these exhibitions, along with a well-organized Cubist show at the 1920 Salon des Indépendants and a revival of the Salon de la Section d’Or in the same year, demonstrated it was still alive.