quipu

The Quechua word khipu (also spelled quipu, from a root meaning 'knot' or 'to knot') names one of the most extraordinary recording systems ever devised. In the Inca Empire — Tawantinsuyu, the Four Quarters of the World — khipu were the primary administrative and possibly literary medium: assemblages of spun and dyed cotton or camelid fiber cords, each hung from a thicker primary cord, knotted in elaborate sequences whose meaning was read by trained specialists called khipukamayuq. The khipukamayuq, whose title means roughly 'keeper of the knot,' devoted their lives to producing, reading, and transmitting the information encoded in these objects. They were the bureaucrats, historians, and perhaps the poets of a state that never adopted alphabetic writing.

The organizational grammar of the khipu is, in its numerical dimension, now substantially decoded. The position of a knot on its cord (distance from the primary cord), the type of knot (single, figure-eight, or long knot with multiple turns), and the direction of its spin all contribute to a positional decimal system capable of representing numbers in the millions. Records of tribute, census data, astronomical calendars, llama herd inventories, and military logistics could all be expressed numerically. The cords' colors — some khipu incorporate dozens of distinct dyes — and the way cords were attached (from top, from bottom, in pendant or subsidiary positions) added further dimensions. The Spanish colonial administrator José de Acosta wrote in 1590 that khipu could record anything, though he confessed he could not read them.

Whether khipu could encode phonetic or narrative information — whether there were 'literary' khipu — remains one of the most tantalizing open questions in pre-Columbian studies. The historian Gary Urton has proposed a binary system of choices in khipu construction (spin direction, plying direction, color, knot type, attachment type) that generates enough combinatorial complexity to encode a syllabic or logographic script. Harvard's Khipu Database Project has catalogued over 900 surviving khipu, and in 2023 researchers announced the first proposed decipherment of a non-numerical khipu from the Andean village of San Juan de Collata, suggesting phonetic elements corresponding to place names. The field is in active ferment.

The Spanish colonial administration largely destroyed khipu as objects of suspected idolatry and dangerous political record-keeping. In 1583, the Third Council of Lima ordered khipu burned on the grounds that they might contain 'superstitions.' Despite this, hundreds survived — in museums, private collections, and, crucially, in the hands of Andean communities that maintained khipu traditions in secret or in plain sight. The word khipu entered Spanish as quipo or quipu during the early colonial period, and from Spanish it passed into English, French, and other European languages as the word for this object that colonial administrators could not read but could not ignore. Today 'quipu' is the standard English term for these knotted records, and the effort to read them remains one of archaeology's most consequential unfinished projects.