Bryan C. Keene is associate curator of manuscripts at The J. Paul Getty Museum, and editor of Toward a Global Middle Ages : Encountering the World through Illuminated Manuscripts (Getty Publications, 219) and contributing author to Florence at the Dawn of the Renaissance : Painting and Illumination, 13-135 (Getty Publications, 213). Karl Whittington is associate professor of history of art at The Ohio State University, and the author of Body Worlds : Opicinus de Canistris and the Medieval Cartographic Imagination, published by the Pontifical Institute in Toronto in 214.