Now this is big-picture thinking. The Fondation Louis Vuitton unveils today an exceptional exhibit of two French Impressionist masterpieces at its New York flagship. On loan from the Musée d’Orsay in Paris and the J. Paul Getty Museum in Los Angeles, respectively, Gustave Caillebotte’s Boating Party (circa 1877-1878) and Young Man at His Window (1876) depict…