Like the Perfect Vacuum of the title, the books that seem to be reviewed in this book do not exist. neither, in an odd way, does "Lem" as a reviewer; in the first chapter, someone reviews the book in reference to his Introduction, but that has not been written, either, and must be deduced from its review. Within the reviews, Lem speaks as the author: in the review of his book, he speaks as reviewer of himself as author. The "I" cannot be finally located.
Literary considerations have expanded to encompass world criticism and the condition of man. Lem has penetrated existentialism with wry humor and a paradoxical emphasis on the emotional needs of the human organism.
M.A. Bartter, Rochester Democrat and Chronicle