THE GARDEN OF FORKING PATHS
Free Will (fate)
"The author of an atrocious undertaking ought to imagine that he has already accomplished it, ought to impose upon himself a future as irrevocable as the past."
Even from the beginning, the reader knows that the main character, Yu Tsun, will eventually die. Though he has the choice to carry out his mission or not, he accepts it as his duty. While he determines his own fate, he also determines the fate of another man named Albert. Considering the murder of a man "as irrevocable as the past," he considers his mission as inevitable as fate.
THE CIRCULAR RUINS
Dreaming vs. Reality
The Magician travels to an island with the intent of creating a perfect human being through lucid dreaming. During his first failed attempt, the magician could not distinguish the dream world from reality, and was thrown into confusion. Though the magician succeeds in making a clone, he realizes in the end that he too, just like his own creation, was created through dreams.
THE LIBRARY OF BABEL
Order and Structure
"The Library is unlimited and cyclical. If the eternal traveler were to cross it in any direction, after centuries he would see that the same volumes were repeated in the same disorder (which, thus repeated, would be an order: the Order).
The Library of Babel describes an infinite library, shaped by hexagonal galleries and hallways. Extending on for eternity, people search for the cyclical book, or the book that decodes the others. Despite the books being the same number of pages and having the same number of letters, there is no order to the placement of the books. In the end, people seek endlessly for this cyclical book, which was "God."