Volume 2 of 2. Lorenzo Ghiberti, sculptor and towering figure of the Renaissance, was the creator of the celebrated Bronze Doors of the Baptistery at Florence, a work that occupied him for twenty years and became known (at Michelangelo's suggestion, according to tradition) as the Doors of Paradise. Here Richard Krautheimer takes what Charles S. Seymour, Jr., describes as "a fascinating journey into the mind, career, and inventiveness of one of...