The Imagined Library Books that were never written

Foucault's Pendulum  ·  Forged history

The Plan

Jacopo Belbo, Diotallevi, and Casaubon

Can I actually read this? Not really. You are told what it contains, but never shown it. Described

A world-conspiracy, generated for a joke from occult manuscripts and a computer named Abulafia, which occultists then treat as a document and try to extract the secret from — hanging one of its authors from a pendulum when he will not hand it over.

The Name of the Rose hid a real lost book in a library and poisoned the pages. Foucault’s Pendulum hides nothing, and that is worse.

Three editors at a vanity press have spent a year with manuscripts about Templars, Rosicrucians, and the shape of the earth. They know how the connections are made because they have had to typeset them. One night they decide they can do it better. The Plan is not a volume. It is a dossier, a timetable, a secret society they named so that history would have someone to be about. Casaubon — Eco named him after George Eliot’s ruinous mythographer — keeps reminding himself they are creating, not discovering. Then the created thing acquires a readership. If you invent a plan and others carry it out, Casaubon says, it exists.

Lia, who has had a child and has not been playing, looks at the founding parchment for a day and a night and hands them a laundry list. The sentence does not save them. Belbo cannot produce the map because there is no map, and the people in the Conservatoire need there to be one more than they need him alive.

File it next to Casaubon’s Key to All Mythologies. Both are systems that mistake connectedness for knowledge. Eliot’s is sterile and dies with the man. Eco’s is fertile and does not.

On the readability rating. Described at length, quoted in fragments of computer file and conversation. There is no Plan to open. That was the joke, and then it wasn’t.

In-world history

Colonel Ardenti brings Garamond a "Templar" parchment. Lia later shows it is a merchant's delivery list. In the meantime Belbo, Diotallevi and Casaubon, bored of real Diabolicals, feed hermetic sentences into Abulafia and invent the Tres, telluric currents, and a six-century timetable. They hint that they know. The people who needed a Plan appear on the solstice to collect it. Diotallevi decides his cancer is the cells inventing a Plan of their own. Belbo dies on the pendulum in the Conservatoire rather than admit there is no map.

Why it matters

Eco had already catalogued a book that kills its readers. This is a book that does not exist until people believe it, at which point it kills its writers. The Plan is the second Poetics run in reverse: nothing on the page, everything in the reading.

Appearances

  • Foucault's Pendulum (1988) — Umberto Eco Il pendolo di Foucault; assembled as a game in a Milan vanity press

Connected volumes

Catalogue record

Category
Forged history
World
Foucault's Pendulum
Imagined by
Umberto Eco
First appearance
Il pendolo di Foucault (Bompiani, 1988)
Readability
Described

Sources

  • Umberto Eco, Il pendolo di Foucault (Bompiani, 1988). English translation by William Weaver (Secker & Warburg / Harcourt, 1989).

Added by house · last checked 2026-09-06