His magnum opus is Spectacles and Other Vision Aids,1 530 pages with nearly 800 illustrations. It is a classic, not just as a reference book, but also for its pointers on collecting. Bill humorously describes how he began collecting while in grade school. He lost a game of marbles and traded his marbles for a knife, which became the basis for collecting edged weapons. Later, spectacles became a lifelong passion. He was certainly influenced by his father, Jonas W. Rosenthal, MD, who also was an ophthalmologist (the museum of ophthalmology at Tulane University is named for him). After his father died, Bill could not bring himself to discard his instruments and they became the nucleus of a different collection. Another influence was his late first wife, Harriet Stern Rosenthal, whose father was the antique dealer Henry Stern, who had a famous antique shop in New Orleans. She cheerfully endured a house full of collectibles. They enjoyed visits to antique shops and flea markets in the search for artifacts. Bill's collection was the starting point for his book on spectacles, which includes descriptions of frames, eyeglass cases, and more unusual items, such as lorgnettes, Eskimo glasses, and quizzing glasses. Other extraordinary items include smoked glasses that judges would wear to hide their emotions and fans made of ivory and silk that incorporate telescopic lenses, which would allow women to spy on people while hiding behind the fan.