Part of a volume responding to Bruno Latour's An Enquiry Into Modes of Existence from the point of view of the Middle Ages, this article examines the fifteenth-century narrative, Le Paradis de la Reine Sibylle by Antoine de la Sale as it is transmitted in manuscript Chantilly, Musée Condé 653. In Latour's terms, this manuscript illustrates the power of fiction [FIC] to fold technology [TEC] and reference [REF]: the manuscript’s folds imitate the folds of fiction, rendering them material and visible within this medieval inquiry. Both Chantilly 653 and Latour enable us to remap geography and chronology, challenging readers from the fifteenth century to the twenty-first to perceive the various modes of existence, rather than the illusory but alluring divide between modernity and its disavowed precursor.