As Paris’s Musée de l’Orangerie prepared to reopen following a 6-year, $36 million renovation, one of the biggest questions was how the Claude Monet masterpieces mounted to the walls had survived the trauma of construction. (These eight paintings cannot be removed, and an elaborate system of alarmed and reinforced boxes had to be devised to protect them from the dust and vibration.) As it turned out, the Monets are fine, and the Orangerie itself, while looking very much the same on the outside, has undergone a radical transformation inside.