Bowl inscribed with sayings of the Prophet Muhammad and ʿAli ibn Abi Talib, Uzbekistan, Samarkand, Samanid period, 10th century. Earthenware covered in slip and painted under glaze. Harvard Art Museums/Arthur M. Sackler Museum, The Norma Jean Calderwood Collection of Islamic Art, 2002.50.88 / Courtesy of Harvard Art Museums