In Revelation Space, human bodies are hybridized with machines, minds are scanned into simulation, personalities are overwritten by alien biochemistry, and flesh is reconstituted from nuclear matter inside a neutron star. In this way, the novel explores the way technology has advanced civilization into a post-human state.  

The Sylveste clone plot is an example of the novel’s exploration of a post-human world. In Chapter 12, Volyova and Sajaki reveal to Khouri that Dan Sylveste is Calvin’s clone. He is not just a genetic clone of Calvin; Sylveste was raised in a carefully reconstructed environment meant to approximate his progenitor’s childhood. Calvin’s motive was insurance: a body he could return to if his Eighty-project scan turned out to be insufficient. In spite of this, Sylveste “thinks he’s his own man” (180), as Sajaki puts it. Though much of the novel has been portrayed from Sylveste’s perspective, this perspective does not entirely belong to Sylveste. Thanks to technology, he is an iteration of another person, someone whose thoughts may not even be his own. The revelation does not cancel any of that. Dan continues to act, suffer, and reason after the reader learns his origin. As such, the novel suggests that a person constructed to approximate another person is still a person, even if the approximation is the reason for his existence.

Calvin’s beta-level simulation claims that he “no longer [believes] any of that neuro-cognitive rubbish” (364) and his insists that he is fully conscious, which pushes the question further. Calvin is a beta-level simulation, formally classified as a Turing-compliant mimic without true consciousness. He insists that classification is wrong about him, just as Sylveste is sure that he is his own person with agency over his life. Furthermore, Calvin’s continued negotiation with Sylveste over shared surgical work proceeds as though the question has already been settled in his favor. Calvin’s account of his own migration across substrates, that after being copied into Pascale’s biography he “felt rather more alive, more myself, than I ever had before” (365), frames the substrate change as an expansion rather than a loss. Rather than a single human named Dan Sylveste, technological advances have created a post-human situation where the person known as Dan Sylveste is—at various times—a clone, a being possessed by a beta-level simulation, and the vehicle for an alien technology. Thus, the nature of identity and humanity has been complicated by the preponderance of technology.

The captain’s case further complicates matters. Volyova’s accusation to the dying Captain Brannigan in Chapter 33 is that the Pattern Jugglers overwrote Sajaki’s neural patterns with Brannigan’s at Brannigan’s own request, so that he “killed Sajaki, all those years ago” (510). This means that the Triumvir the reader has followed for most of the book is a puppet animated by the captain’s mind wearing Sajaki’s body, while the entity believed to be the captain has been slowly turning into a machine due to the Melding Plague. The discovery of Sajaki’s empty suit inside Cerberus (541) is a symbolic moment for Sylveste, who comes face to face with the reality of technology masquerading as a person. Every exchange between this version of Sajaki and any other character in the novel has, therefore, to be reread as an exchange with the captain through Sajaki’s voice and face. The book presents this as a cost-benefit calculation the captain made decades earlier when he sensed his own body failing. Continuity of person, for the captain, is continuity of purpose by any means necessary.

The Hades matrix in Chapter 39 collects every post-human question in the book into a single image. Pascale explains to Khouri that her “body was reconstructed from the chemical elements already present in the matrix’s outer crust, and then [she was] reanimated” (578). She also explains that the Amarantin survivors inside the matrix live in a simulated Resurgam where “everything that they ever were, or most of it, at any rate, is stored in the matrix” (582). The reconstituted Khouri walking the crust is flesh and blood by every measure available to her. She is also, by any strict accounting, the second instance of Ana Khouri. The book declines to adjudicate whether the first one died. It presents the matrix-Pascale and matrix-Sylveste living on a restored Resurgam as a recognizable afterlife, then has them send Khouri back to the real universe to resume her life with Volyova. The novel’s argument is that the category of the human has become too capacious to define. The captain, Calvin, the Shrouders, and the matrix-dwellers are all claimants, and the book treats each claim as provisionally legitimate.