Synthesized answer
The provided passages do not contain information about specific unanswered questions within the collection "Ficciones" [1]. The description of the book only states that Borges often uses the labyrinth as a literary device to expound his ideas on all aspects of human life and endeavor [1].
Therefore, it is not possible to identify what questions remain unanswered based on the given text [1].
Synthesized from the book passages below. Chat with the book on Feynman for follow-up.
From the book
Title: Ficciones by Jorge Luis Borges Description: A collection of his short stories in which Borges often uses the labyrinth as a literary device to expound his ideas on all aspects of human life and endeavor. ---------- Contains: [Tlön, Uqbar, Orbis Tertius](https://openlibrary.org/works/OL444914W)