An elaborately decorated diagram from a copy of the alchemical treatise Kit?b al-Burh?n f? asr?r 'ilm al-m?z?n (Proof Regarding the Secrets of the Science of the Balance) by al-Jaldak? (d. 1342). The undated and unsigned copy was made in Morocco and is typical of products made in the scribal workshops of Marrakesh during the second half of the 19th century.