Editing Tlön, Uqbar, Orbis Tertius (section)

===Levels of reality===
There are several levels of reality (or unreality) in the story:

* Most (but not all) of the people mentioned in the story are real, but the events in which they are involved are mostly fictional, as are some of the works attributed to them. This is discussed in detail in the section below on real and fictional people.
* The main portion of the story is a fiction set in a naturalistic world; in the postscript, magical elements have entered the narrator's world. The main portion could certainly be seen as a false document; the postscript may dissolve the illusion.
* The land of Uqbar is fictional from the point of view of the world of the story. The supposed ''Anglo-American Cyclopaedia'' article on Uqbar proves, within the story, to be a [[fictitious entry]].
* Mlejnas, and Tlön as it is first introduced, are fictional from the point of view of Uqbar. In the course of the story, Tlön becomes more and more "real": first it moves from being a fiction of Uqbar to being a fiction of the narrator's own naturalistic world, then it begins (first as idea and then physically) taking over that world, to the point of finally threatening to annihilate normal reality.