Geomancy tool Geomantic instrument, Egypt or Syria, 1241–42 CE, by Muhammad ibn Khutlukh al Mawsuli. When turning the dials, random designs of dots would appear, which were then interpreted. British Museum. Geomancy (Greek: γεωμαντεία, "earth divination") is a method of divination that interprets markings on the ground or the patterns formed by tossed handfuls of soil, rocks, or sand. The most prevalent form of divinatory geomancy involves interpreting a series of 16 figures formed by a randomized process that involves recursion followed by analyzing them, often augmented with astrological interpretations. Once practiced by people from all social classes, it was one of the most popular forms of divination throughout Africa and Europe in the Middle Ages and the Renaissance. In Renaissance magic, geomancy was classified as one of the seven "forbidden arts", along with necromancy, hydromancy, aeromancy, pyromancy, chiromancy (palmistry), and spatulamancy (scapulimancy). A shield chart.