The magnificent manuscripts associated with Charlemagne's circle are among the treasures of medieval book art. In both the works of the "Court school" and the "Group of the Vienna Coronation Gospels," imitated materials play a major role. Ilka Mestemacher is the first to explore the aesthetics, iconography, and technique of painted marble columns and precious stones. Through the focus on materials, she sheds light on the relationship between book illumination and contemporary architecture and goldsmithing. In addition, Mestemacher examines the Christian discourse on the imitation of nature. With its numerous color illustrations, the monograph offers a completely new view of the magnificent Carolingian manuscripts.