Tondi (autonomous paintings or sculpture in a circular format) became a popular art form in Florence between the mid-fifteenth century and approximately 1520. A large majority of tondi—which feature the Madonna and Child, often in the company of saints or angels and occasionally in narrative scenes—were generally created for private devotion in the home during the Renaissance. Examples of famous tondi include Domenico Veneziano’s Adoration of the Magi (Berlin, Gemäldegalerie, ca. 1441), Sandro Botticelli’s Madonna...