Ilm al-Raml (علم الرمل, "science of sand") has its roots in pre-Islamic Antiquity. The Bedouins of the Hejaz already practised "darb al-raml" (striking the sand) to question destiny before crossing the desert. Islamic tradition attributes the invention of this art to the prophet Idris (identified with Enoch in the Bible and Hermes Trismegistus in the Hermetic tradition), considered the "father of sciences". The geographer al-Masudi, in his Meadows of Gold (Muruj al-Dhahab, c. 947), mentions that geomancy was already widespread among the Arabs before Islam, with diviners tracing signs in the sand of the Rub al-Khali to predict rains and raids. Traces of similar geomantic practices have been found on Mesopotamian cuneiform tablets dating from the 2nd millennium BC.
The golden age of Ilm al-Raml coincided with the Abbasid period (8th–13th centuries). Caliph al-Mamun (813–833), founder of the House of Wisdom (Bayt al-Hikma) in Baghdad, had Greek and Persian divination texts translated, enriching the Arab tradition. The foundational treatise of the discipline is the work of Muhammad ibn Muhammad al-Zanati, a Berber scholar from the Zanata tribe of North Africa (13th century), author of Al-Fasl fi usul ilm al-raml. This text systematised the 16 figures, their planetary and elemental correspondences, and the derivation methods (tahwil). Ibn Khaldun devoted an entire chapter of his Muqaddimah (1377) to geomancy, classifying it among the "occult sciences" while acknowledging its popularity throughout the Muslim world.
Arab geomancy crossed the Mediterranean by two main routes. The first passed through al-Andalus: Hugo of Santalla translated the first Arab geomancy treatise into Latin at Tarazona, in Aragon, around 1140, under the title Ars Geomantiae. The second took the Crusade routes: Frankish knights brought the practice back from the Levant in the 12th century. In Europe, geomancy became one of the most respected divinatory arts of the Middle Ages. Cornelius Agrippa devoted a chapter to it in De Occulta Philosophia (1531), and Robert Fludd published a detailed treatise in 1687. An apocryphal work, "The Oracle of Napoleon", claimed that Bonaparte consulted geomancy before his campaigns.
The geomantic system rests on a remarkably elegant binary code: 4 lines of 1 or 2 dots generate 2⁴ = 16 possible figures. The mathematician Leibniz, who formalised the binary system in 1703, drew inspiration from the Chinese I Ching, a structurally related system (6 lines for 2⁶ = 64 hexagrams). The kinship between Arab geomancy and the I Ching has fascinated researchers: the ethnologist Robert Jaulin, in La Géomancie (1966), proposed a structuralist analysis showing that the 16 figures form a complete algebraic group under the XOR operation — each pair of "mother" figures produces a unique "daughter" by binary addition. The mathematician Ron Eglash, in African Fractals (1999), demonstrated that African geomancy practitioners intuitively manipulated information theory concepts well before Shannon.
Psychology and anthropology have examined the cognitive mechanisms at work in geomantic consultation. The anthropologist Philip Peek, in African Divination Systems (1991), showed that geomancy functions as a "hermeneutic frame": the randomness of figures generates a space of meaning that the consultant and diviner co-construct through interpretation. The Barnum effect (Forer, 1949) — the tendency to accept vague descriptions as personally relevant — plays a central role. However, the work of Victor Turner on the Ndembu and Evans-Pritchard on the Azande shows that divination cannot be reduced to a "cognitive bias": it fulfils a social function of conflict mediation, offering a neutral arbiter accepted by all parties.
In the contemporary Maghreb, Ilm al-Raml remains vibrant despite modernisation. In Morocco, geomancers practise in the medinas of Fez, Marrakech and Meknes — the anthropologist Abdelhafid Chlyeh, in Les Gnaoua du Maroc (1999), documents their integration into the social fabric alongside Sufi brotherhoods. In Mauritania, the practice is so widespread that the term "khattat" (sand tracer) denotes a recognised profession. In West Africa, Arab geomancy merged with the Yoruba Ifá system: the 16 basic figures correspond exactly to the 16 major Odu, a kinship studied by historian Théodore Monod and ethnologist William Bascom (Sixteen Cowries, 1980). In Madagascar, Sikidy (from the Arabic "sidq", truth) perpetuates the tradition through the ombiasy (diviners). Today, mobile apps and online simulators like ours allow people to discover this millennial art, while UNESCO inscribed the related Ifá system on the Intangible Cultural Heritage list in 2005.