The grit and grandeur of New Orleans helped give rise to an icon of French Impressionism. Edgar Degas's mother was from New Orleans and from the time he buried her, he pined for Louisiana. In 1872, when he arrived, he found New Orleans wracked with devastation. He struggled with the conflict of helping his family' bankrupt cotton business, while pursuing his passion to paint. Amidst this turmoil, blossomed a tragic friendship with his blind sister-in-law,...