Eiffel Tower

The Eiffel Tower is both a real Paris monument and, in the novel’s escalating conspiracy, an imagined instrument connecting subterranean forces to the sky. Jacopo Belbo first interprets it as an antenna that gathers signals from hidden sites around the world; at the climax, Casaubon’s vision of the Tower transforms that conjecture into apparent proof that the Plan exists. Its conspicuousness is central to its meaning: it is supposedly a secret device in plain sight, and the distinction between the city’s actual architecture and the narrator’s delusion becomes perilously difficult to hold.

From city antenna to occult instrument

Belbo’s interpretation begins during a night of insomnia. Looking from his window across Milan, he sees the lights of the steel tower used by Italian Radio and recognizes, in that ordinary urban antenna, a possible model for an unseen network. The next morning he proposes that the Eiffel Tower is a “metal megalith” and the “menhir of the last Celts”: a structure unnecessary as a monument but useful as a probe connecting the earth’s hidden channels with the heavens.

In Belbo’s account, the Tower receives information from supposed hermetic valves embedded in the planet’s crust and compares it with signals from the sky. He gathers sites of radically different kinds into the same proposed system: the statues of Easter Island, Machu Picchu, the Statue of Liberty, the Luxor obelisk, Tomar’s highest tower, Stonehenge, and the television antenna on the Empire State Building. Their scattered locations become, through his interpretation, stations in a single planetary apparatus. The chain is sustained not by evidence of communication among the monuments but by the Plan’s capacity to make each resemblance and coincidence appear significant.

Belbo extends this reinterpretation to the history of science. The space race, he suggests, can be read as a program for photographing the earth’s crust, locating invisible tensions, submarine tides, and warm-air currents, while satellites communicate with one another and with the Tower and Stonehenge. Technology that ordinarily belongs to exploration and observation is recast as the machinery of a hidden terrestrial network. The Tower’s importance therefore rests less on a demonstrated function than on its place in an explanatory story that absorbs modern science into the Plan.

The Tower in the Plan’s imagined geography

The Tower’s invented purpose also links it to the larger map that Belbo and his colleagues have built from historical and occult materials. In the account of Hitler’s supposed strategy, the conquest of Paris is explained as a means of gaining control of both the Pendulum and the Eiffel Tower. This claim is part of the characters’ conspiratorial reconstruction, not an independently established account of history: the Plan makes military campaigns legible as steps toward a secret map and a network of occult centers.

The Tower’s role is repeated in Casaubon’s late-night interpretation of Paris. He imagines the Conservatoire as a laboratory, the Eiffel Tower as a probe, and the Beaubourg as a global transmitter and receiver connected to the underground kingdom of Agarttha. A radio apparatus displayed at the museum becomes, in his reading, a device designed for the Tower and for the transmission of time signals among France, Tunisia, and Russia. The imagined connections are visibly unstable: his own account momentarily pairs Fez with Tunisia and then acknowledges that Fez is not there, just as the Assassins belong to Persia rather than the location assigned to them. Instead of checking or correcting the map, Casaubon treats such mismatches as details that can be ignored within a supposedly transcendent design.

The Tower is also made to replace the Pendulum as the system’s fixed point. Casaubon’s associative geography draws together Beaubourg, underground conduits, Saint-Merri, and the Tower, making Paris seem less like a city of separate buildings than an apparatus whose structures communicate with the earth’s interior. In this scheme, monumental architecture is not merely a collection of landmarks: it is the visible surface of a hidden mechanism. The more conspicuous the structures are, the more readily Casaubon imagines that their true purpose can escape notice.

Casaubon’s encounter and the collapse of distance

Casaubon approaches the Tower after asking a taxi driver to take him to Avenue Élisée-Reclus. The route does not resolve his suspicions; instead, he reads Paris street names as warnings and takes his arrival at the Tower as confirmation that the city has led him there deliberately. This moment changes the Tower from an object of theory into a physical presence that organizes his perceptions.

From close beneath it, Casaubon cannot take in the structure as a whole. He describes a metal spider, an enclosing web of ribs and edges, and a body whose underside and internal spaces seem to swallow him. The Tower no longer appears like the familiar landmark seen above the roofs. Its changing frames hide and reveal the moon; a plane’s red and white lights disappear behind a rib, and he interprets their vanishing as a passage into another space-time. He imagines the lattice overturning reality and leafing through parallel worlds. The details of the actual view are thus narrated through a consciousness that has already decided the Tower is an instrument of the Plan.

Casaubon’s vision culminates in a reversal of scale and function: the Tower, he thinks, suspends the universe from its spire and serves as a substitute for the Pendulum. He imagines it drawing waves from a hollow earth and transmitting them to the world’s megaliths. The structure’s visible ironwork becomes, in his account, a cosmic machine—at once antenna, magnetized pin, and instrument of domination. Its ordinary immobility cannot settle his perception: either the Tower rotates above him or it remains fixed while the heavens seem to move. In both versions, the dizzying effect is the same.

Proof, paranoia, and the final reversal

Casaubon’s interpretation culminates in a conclusion that confuses the reality of the building with the truth of the conspiracy. Because the Tower is physically real, he decides, Belbo must be dead and the Plan must be real. Yet the Tower’s existence establishes only the presence of the monument, not the secret function Casaubon assigns to it. The scene makes his reasoning visible as a self-sealing loop: the Plan tells him what the Tower means, and the Tower’s overwhelming material presence then seems to verify the Plan.

The episode does not simply make the Tower a symbol of hidden power. Its significance lies in the contradiction between public visibility and alleged secrecy. Belbo’s imagined network is supposed to have been in plain sight all along, while Casaubon’s conviction depends on seeing familiar Paris through a pattern that ordinary observation cannot confirm. The novel’s movement from Belbo’s speculative, even playful theory to Casaubon’s fearful certainty marks a consequential change: the invented system has outgrown its status as a game and begun to dictate how he experiences the city.

As Casaubon finally struggles to leave the Tower’s shadow, a taxi driver confirms only that the structure can be frightening at night. That modest observation offers no support for the Plan’s occult machinery, but it preserves the scene’s ambiguity: the Tower can genuinely overwhelm a person standing beneath it, even as Casaubon’s interpretation of that sensation exceeds what the evidence warrants. The monument becomes the narrative’s most forceful image of how an actual object can be recruited into a false explanation—and how, once that explanation has taken hold, the visible world can seem to speak its language.