"Tlön, Uqbar, Orbis Tertius" as I understand it is more ambiguous about exactly why Tlön is becoming real in the narrator's world. Although there is a description in the afterword of such a guild having fabricated Tlön and some artifacts from there, the story up to that point seemed to take Tlön's metaphysics (in which the idea of a reality
outside of our perceptions is considered absurd and impossible) pretty seriously, and the end of the story presents the situation as though the narrator's world is actually starting to work according to these principles. That could conceivably be for merely social-perception reasons, although according to Tlön's philosophy there
couldn't be any such thing as "merely social-perception reasons" because social perception obviously wholly creates the real and only reality.
One could imagine that the guild called up something it then couldn't put down, but necessarily because people will or prefer it so, but somehow because the world, at least in the story, fundamentally could work this way.
The Wikipedia article discusses how confusing it is to understand the exact position of the story with respect to narrative truth, when the entire story is playing with the idea of what is real and what makes it real, as well as explicitly talking about the idea of fiction coming to life:
https://en.wikipedia.org/wiki/Tl%C3%B6n,_Uqbar,_Orbis_Tertiu...
One could imagine that the guild called up something it then couldn't put down, but necessarily because people will or prefer it so, but somehow because the world, at least in the story, fundamentally could work this way.
The Wikipedia article discusses how confusing it is to understand the exact position of the story with respect to narrative truth, when the entire story is playing with the idea of what is real and what makes it real, as well as explicitly talking about the idea of fiction coming to life:
https://en.wikipedia.org/wiki/Tl%C3%B6n,_Uqbar,_Orbis_Tertiu...