Bowl Inscribed with Sayings of the Prophet Muhammad and 'Ali ibn Abi Talib, Persian, Samanid period, 10th century. Reddish earthenware covered in white slip and painted with black (manganese and iron) and red (iron) under clear lead glaze, 9.6 x 26.9 cm. Harvard Art Museums/Arthur M. Sackler Museum, The Norma Jean Calderwood Collection of Islamic Art, 2002.50.88. Photo © President and Fellows of Harvard College