Steve Wynn bought Picasso’s “Le Rêve.”. Then he accidentally put an elbow through it. “The puncture left a several-inch tear across Marie-Thérèse’s voluptuous left forearm.” Now it’s been repaired and will go on show this week. “No cynicism is needed to assume that one goal of the exhibition is to publicly demonstrate that repairs to “Le Rêve” have not had serious effect on its market value.”