->''Tlön is surely a labyrinth, but it is a labyrinth devised by men, a labyrinth destined to be deciphered by men.''

'"Tlön, Uqbar, Orbis Tertius" is a 1940 MagicRealism short story by Creator/JorgeLuisBorges. Although it's only a few thousand words long and not a particularly easy read, it quickly became one of the most influential works of fiction of the 1940's.

The report begins with an unnamed narrator, who becomes fascinated with the land of "Uqbar" that a friend tells him of. Uqbar, as it turns out, only exists in an article found in only one copy of one edition of ''The Anglo-American Cyclopaedia'', and the article is mostly self-referential.

Slowly, however, more details on Uqbar start finding their way into the narrator's life. The purported nation seemingly once had an extensive mythology, based around the mythical land of Tlön. Tlön's philosophy and linguistics paint a fascinating picture of a holistic mysticism. Using the mindset of this mythical land, its inhabitants could allegedly find things simply by expecting to find them, regardless of whether or not these things existed previously. In the minds of these mythical Tlön people that the Uqbar culture spoke of, simply thinking, or writing, about objects and events could cause them to be real.

The narrator decides that both Uqbar and its stories of Tlön can only be inventions of a particularly creative author -- or rather, a group of natural scientists and philosophers who combined their knowledge to create such complicated WorldBuilding.

"Tlön, Uqbar, Orbis Tertius" directly inspired many popular works of fiction, most notably the ''Literature/CodexSeraphinianus''. Its cultural impact can also be found in ''VideoGame/{{Myst}}'' and, prominently, in ''Literature/HouseOfLeaves''.
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!! Provides examples of:

* AncientConspiracy
* DirectLineToTheAuthor
* HollywoodAtheist: The 19th-century millionaire who agreed to fund the creative endeavors of Orbis Tertius, strictly on the grounds that the completed work "have nothing to do with the impostor, Jesus Christ".
* LanguageEqualsThought: Their strange language leads to the people of Tlön developing a philosophy similar to Berkeleyan idealism, but without his benevolent {{God}}.
* LiteraryAgentHypothesis
* MindScrew
* RewritingReality
* StarfishLanguage: The languages of Tlön have no nouns but only verbs or adjectives, reflecting the philosophy of its speakers (they see the world not as a set of objects with continuity in time, but a succession of events and transitory qualities). The phrase "The moon rose above the river" is translated into Tlönian as ''Hlör u fang axaxaxas mlö'', which approximates to "Upward behind the onstreaming it mooned."
* UnreliableNarrator: [[ConversationalTroping Conversed]]. The story begins with the narrator and his friend discussing how one might write a novel with an narrator so subtly unreliable that only a few perceptive readers would discover the truth.
* WorldBuilding
* YourMindMakesItReal
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