The CriticReviewer
The unnamed author of the critique who analyzes and deconstructs S. Lem's book, eventually realizing the review itself might be a meta-fictional creation of Lem.
NarratorReviewer
S. LemAuthor
The writer of A Perfect Vacuum whose motives, anxieties, and philosophical ideas are the subject of the Critic's analysis.
LemAuthor
Jorge Luis BorgesReferenced author
A contemporary writer cited as a predecessor in the art of reviewing nonexistent books.
Borges
Herbert QuaineFictional author
A fictional author created by Borges, referenced to establish the literary tradition of the pseudo-review.
RabelaisReferenced author
An early practitioner of the nonexistent book review, mentioned by the Critic.