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The Ouvroir de littérature potentielle was founded in 1960 by Raymond Queneau and François Le Lionnais; its constraint-based method — the lipogram, the N+7, the snowball — was a formal argument about what literary freedom actually means.

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The Ouvroir de littérature potentielle founded constraint as a method — and argued, by example, that the tightest cage produces the freest writing.
In November 1960, the mathematician François Le Lionnais and the novelist Raymond Queneau convened a small group in Paris under the name Séminaire de littérature expérimentale, quickly renamed the Ouvroir de littérature potentielle — the workshop of potential literature, universally shortened to Oulipo. The founding membership included mathematicians alongside writers, and that combination was not incidental. The group's core conviction was that literary form could be studied as a combinatorial system: that a constraint, properly designed, does not limit what a writer can say but reveals possibilities that unconstrained composition would never reach.
The argument was partly a polemic. Queneau was impatient with Surrealist automatic writing — the doctrine, dominant in Paris since André Breton's Manifeste du surréalisme in 1924 ↗, that the unconscious, left to run freely, was the only authentic literary engine. Oulipo inverted this: the unconscious is not free, it is lazy. A formal rule forces the writer into territory the unconstrained mind would never visit. The group called the buried constraints inherited from literary tradition "plagiarism by anticipation" — Dante and Villon had been Oulipians without knowing it.

The lipogram — writing that excludes one or more letters — sounds like a parlour game until Georges Perec uses it. La Disparition (1969), translated into English as A Void, is a novel of nearly three hundred pages written without a single use of the letter e, the most common letter in French. The disappearance of the e — disparition in French — mirrors the novel's plot, in which characters vanish without explanation and no one can name what is missing. The constraint and the theme are the same object. Perec does not deploy the lipogram despite its difficulty; he deploys it because the difficulty is the meaning. Perec joined Oulipo in 1967 ↗ and went on to write La Vie mode d'emploi (1978), a novel constructed on a knight's-tour chess problem applied to the floor plan of a Parisian apartment building — a different constraint, the same insistence on generated structure over organic inspiration.

Queneau's own Cent mille milliards de poèmes (1961) — One Hundred Thousand Billion Poems — is a set of ten sonnets printed on card stock, each line on a separate strip so that any first line can be combined with any second line from any of the ten sonnets, any second with any third, and so on through fourteen lines. The result is 10¹⁴ formally valid, metrically consistent sonnets: more poems than a reader could read in several lifetimes. The book exists as a demonstration that the sonnet form, far from exhausted, contains an effectively infinite interior.
The N+7 procedure, more purely algorithmic, replaces every noun in a source text with the noun that appears seven entries later in a given dictionary. Applied to a canonical passage — a fable by La Fontaine, say, or a paragraph of Descartes — it generates a new text that preserves grammatical structure and syntactic rhythm while making the content entirely strange. The result is both satirical and analytical: it reveals how much of a text's apparent meaning is carried by its form rather than its words.
Oulipo never claimed its constraints were the only legitimate method. The group described its output as potentielle — potential — meaning the constraints were engines for generating literary possibility, not prescriptions for all writing. What they did claim, and what their best texts demonstrate, is that the writer working under a rigorous formal rule is making more decisions per sentence, not fewer. The constraint is not a substitute for thought; it is an intensifier of it. When Perec's 300-page novel lands and the reader learns, retrospectively, what letter was always absent, the effect is not a trick but a formal argument, delivered in full.