The 13th century book "Ajā'ib al-makhlūqāt wa gharā'ib al-mawjūdāt" "(The Wonders of Creation)" by Zakariya al-Qazwini describes Islamic angelology, and is often illustrated with many images of angels. The angels are typically depicted with bright, vivid colors, giving them unusual liveliness and other-worldly translucence. While some angels are referred to as "Guardians of the Kingdom of God," others are associated with hell. An undated manuscript of "The Wonders of Creation" from the Bavarian State Library in Munich includes depictions of angels both alone and alongside humans and animals. Angels are also illustrated in Timurid and Ottoman manuscripts, such as "The Timurid Book of the Prophet Muhammad’s Ascension" () and the "Siyer-i Nebi""."