In the 15th century, Luca della Robbia (1399/1400–1482) invented a glazing technique for sculpture characterized by brilliant opaque whites and deep cerulean blues. Luca shared the secrets of his technique with his nephew and principal collaborator Andrea della Robbia, who in turn passed them on to his sons Giovanni, Luca the Younger, Marco, Francesco, and Girolamo. The Della Robbia family workshop flourished in Florence for about a century, producing expressive artworks for all spheres of life. Portraying both sacred and secular themes, it gained a strong presence in public spaces—from …