Deception is the central idea of this piece. Had the doubtful quote of â€œmirrors and copulation are abominable for they multiply the number of mankindâ€ been said by Bioy Casares, the quest to seek the truth of Uqbar would have never existed. This and many other mirror imagery throughout the piece contributes to the deception of reality topic symbolically. â€œMirror troubled the far end of a hallwayâ€ because it creates an illusion that the hallway is twice as long as it should be. Deception causes the obscurity of truthâ€”thus the truth that we seek might not be trust worthy. Therefore in attempt to do away with the deception caused by science, the Tlonians â€œpresuppose idealismâ€ by seeking â€œnot truth, or even plausibilityâ€ only an enlightenment toward an ideally monistic universe. Yet to an even greater degree, the speaker realizes as he describes in the Postscript the creation of Tlon was a deception in itself. The nihilistic Ezra Buckley attempts to â€œdeceiveâ€ God by theoretically playing God in the creation of Tlonâ€”Buckley envisions that â€œmortals could conceive and shape a worldâ€. Ultimately, the world of Tlon replaces the world as we know it because â€œreality â€˜caved inâ€™â€ in the face of the nonexistent deception of truth known as Tlon.
Borges continues to explore the idea of monism in this piece, but more specifically toward the monism of religion and spirituality. The piece is a â€œcommentaryâ€ of a nonexistent mystery story which explores the religious strife of Indiaâ€”to an extent spiritual and religious strife of the world. The protagonist began his quest after â€œhe reflects that he has shown himself capable of killing an idolater, yet incapable of knowingâ€¦whether the Muslim possesses more of truth than the [Hindu] does.â€ The novel