Borrowed From Another Trade: Eight Decisive Ideas

There is a way of producing a new idea that requires no flash of insight: take a procedure that is entirely ordinary in one trade, and apply it where nobody has tried it. The move costs its author very little — the tool is already familiar — and looks extraordinary to everyone who knows only the field it landed in.

The eight cases below share that structure. In each one, the imported knowledge was already formed, taught and in daily use somewhere else: an Italian musical form, a ritual authority, a playwright’s device, a teacher’s craft, a perforated piano roll. What was new was the delivery address — and the question of who, at that address, would sign for it. Two of the eight sat unused for decades.

Bach: an Italian device moved to the German organ

Johann Sebastian Bach was trained as a copyist. Under his brother Johann Christoph he learned organ, harpsichord and composition by copying out Froberger, Kerll and Buxtehude. It was teaching by imitation: not a theory explained to him, but other men’s works run through his own hand.

From 1708 to 1717 he served Duke Wilhelm Ernst of Saxe-Weimar as court organist and then Konzertmeister. There he transcribed Italian concertos for organ and harpsichord — Vivaldi above all — and took from them what he wanted: the ritornello principle, and a technique of modulation built for a string orchestra. He applied both to a tradition that had no use for them, the Lutheran chorale and the German organ prelude.

Nanny of the Maroons: ritual authority turned into military doctrine

The sources on Nanny of the Maroons come in two kinds — hostile British colonial reports, and the oral tradition of Moore Town — and both leave her birth and death dates approximate. What they describe in common is a command in which the religious and the military are not separate functions. Leader of the Windward Maroons from around 1720, she had every expedition preceded by Obeah ceremonies and consultations of the ancestors; the same authority let her impose initiation rites on new runaways, rites that secured their loyalty and pooled their farming knowledge.

Akan knowledge of lineage organisation became an instrument of war: a mixed council in which women held logistics and medicine, abeng horn signals, trails deliberately left open to draw soldiers into narrow gorges. Nanny Town held out against the assaults of 1724 and 1728 and fell to British artillery in 1734.

The treaty of 23 March 1739 was negotiated by Quao and the Maroon captains. Nanny was not present at the signing, and colonial documents name her as spiritual chief, while Maroon tradition credits her with the essential terms — recognition of the villages, land, exemption from tax. Historians still argue about that treaty: co-optation by the empire, or the compromise that made survival possible.

Olympe de Gouges: the 1791 Declaration is a stage device

Olympe de Gouges received only a rudimentary education. Widowed at eighteen, settled in Paris from 1770 under a name she had invented for herself, she learned her craft in the theatre: Zamore et Mirza, or Slavery of the Blacks, written in 1784, reached the Comédie-Française only in 1789, after years of censorship.

Her best-known text is a tracing. In the Declaration of the Rights of Woman and of the Female Citizen of September 1791 she goes through the 1789 text article by article and substitutes women — citizenship, property, access to public office. The device is dramatic before it is legal: replay a scene the audience knows, change one variable, and let them see what the change exposes.

She kept the theatre’s distribution logic too. Her political memoirs circulated as placards posted in the streets of Paris and outside the National Assembly, texts built to be read standing up. She was tried and guillotined in 1793.

Jaurès: a philosophy teacher’s equipment, used from the tribune

Jean Jaurès entered the École normale supérieure in 1878, passed the agrégation in philosophy in 1881, and taught at Albi and then Toulouse; his first Latin thesis was on Fichte. Nothing there announces a party leader — a provincial teaching career, and the first-hand knowledge of working-class life that came with it.

Elected deputy for the Tarn in 1885, at twenty-six, he arrived with the only equipment he had: how to build an argument, and the habit of explaining. That is what gave him his standing during the Carmaux glassworkers’ strike of 1892, and then in the Dreyfus affair, where he took the forgeries in the file apart piece by piece.

The most durable trace of the transfer is a physical object: L’Humanité, which he founded in 1904. Not a propaganda sheet but a daily paper conceived as an instrument of instruction — his former trade, scaled up to a movement. He was assassinated at the Café du Croissant in 1914.

Mao: a teacher-training method applied to a party

Before 1921, Mao Zedong was a student at the Changsha teacher-training school and then a clerk in the Peking University library, where he worked in 1918 under Li Dazhao, running reading circles on universal education and land reform.

The tool he carried out of those years was the survey. His “Report on an Investigation of the Peasantry in Hunan” (1927) does not theorise the peasantry, it counts it; his 1937 texts make a principle of it — truth is tested in action, and the Party must “learn” before it “leads”. At Yan’an, after the Long March and the Zunyi conference of 1935, he installed cadre schools, revolutionary theatre and systematic social surveys.

The transfer has a second face, inseparable from the first. The same apparatus — literacy campaigns, collective readings, criticism and self-criticism sessions, rectification drives — went on to serve the Great Leap Forward of 1958 and then the Cultural Revolution of 1966: universities closed, cadres humiliated in struggle sessions, lasting trauma. An imported method is not good by construction. It is powerful.

Shannon: Boolean algebra wired to relays

Claude Shannon left the University of Michigan in 1936 with a double degree in mathematics and electrical engineering. That double membership is the whole story.

His master’s thesis, submitted at MIT in 1937, applies Boolean algebra to relay circuits. The algebra had been built to formalise logical propositions; Shannon showed that it describes exactly what an electrical switch does. Digital circuits have been designed on that basis ever since.

Then he did it again. Hired by Bell Labs in 1941, he worked on transmission and on military cryptography, and drew out of it a statistics of the message: “A Mathematical Theory of Communication”, published in 1948 in the Bell System Technical Journal, treats information as a measurable quantity and a transmission path as a channel with finite capacity. His cryptographic result — perfect secrecy requires a key as long as the message — comes from the same displacement.

Lamarr: a perforated piano roll against jamming

Hedy Lamarr was an actress under contract to MGM, trained at Max Reinhardt’s school, made famous by Ekstase in 1933 and living in Hollywood since her flight from Europe in 1937. The daughter of a pianist, she had also spent her brief marriage to the arms manufacturer Fritz Mandl among people who discussed remote-control systems.

In 1941-42, with Axis submarines in mind, she worked out with the composer George Antheil a guidance system designed to make a radio-controlled torpedo impossible to jam. Patent US2292387, filed on 11 August 1942, describes a transmitter and a receiver that change frequency together, synchronised the way the perforated rolls of player pianos are. The transfer is literal: a mechanical score becomes a radio synchronisation key.

The US Navy did not put the invention to work. It kept the technology, revisited in the 1960s for secure communications, while Lamarr was assigned to war-bond tours. Recognition came in 1997 with the Electronic Frontier Foundation’s Pioneer Award, then in 2014 with the National Inventors Hall of Fame. Spread spectrum is now in Wi-Fi, GPS and Bluetooth.

Hopper: teach first, compile second

Grace Hopper read Whitehead and Russell as a teenager, took a mathematics doctorate at Yale in 1934 with a thesis on Laplace series, and taught analysis and geometry at Vassar College. She volunteered for the Navy Reserve at thirty-four, with a waiver for age and weight, and found herself at Howard Aiken’s Harvard Computation Laboratory, on the Mark I.

What she produced there is telling: routines for ballistic trajectory calculations, and user manuals. Structured documentation entered computing through a teacher, for the reason that makes it necessary in a classroom — what is not written down cannot be handed on.

The compiler follows the same logic. Hired in 1949 to work on the UNIVAC, she designed the A-0 System, which translates mathematical instructions into machine code: from then on the machine accepted a notation made for humans, rather than the reverse. Flow-Matic extended the idea to English words, and the CODASYL committee of 1959 produced COBOL. Her case fitted in one sentence — using words rather than numbers widens the pool of people who can program and reduces errors. That is a teacher’s argument, not an engineer’s.

What the eight cases say about new ideas

A transfer does not succeed on its own merits. Lamarr’s patent described a working device; it slept for twenty years for want of a navy willing to study it. Hopper had to found a committee, CODASYL, to turn her notation into a standard. Shannon was already inside the institution that needed his result. The difference is not in the quality of the ideas.

It is a variant of something visible among the scientists who were right too early: being right is not enough, you also have to be in a position to be heard. But importing adds a difficulty of its own. Whoever carries a method across is by definition a foreigner where it lands, and that is exactly what makes them suspect: an actress filing a patent, a woman with no formal schooling rewriting the Declaration of Rights.

Two other figures on this site made the same move. Ada Lovelace read Babbage’s machine as an instrument for manipulating symbols and not only numbers; Ibn Khaldun, a jurist and administrator, applied to the writing of history a method taken from the practice of government. Both were recognised long afterwards, which is also the fate of several major figures nobody talks about.

The lesson fits in one line. New ideas rarely come from nowhere. They come from next door.