Orchestrated for the Lima Biennale (by this time, the Belgian had become a favorite of the festival circuit, despite his sending a peacock in his stead to the Venice shindig as a get stuffed gesture), this action consisted of 500 shovel-toting volunteers spading a massive sand dune forward two inches. Performed and duly recoded in an area where millions of displaced people still live today, Alÿs presented a real-life parable for the faithful and faithless alike. Social mobilization or political engagement as a mirage? Mountains were moved. Despite the video record, the drawings, the collages, and mock-didactic paraphernalia, the artist finally, generously leaves it for the viewer at MOMA to decide.