Borges loved to explore the idea of infinity. Another story of his, The Garden of Forking Paths, explores the idea of a multiverse.

One other interesting tidbit that always intrigued me about Borges is that he became completely blind while he was the director of the Argentine National Library. In a strange irony, it became his own "Library of Babel", in the sense that he had so much knowledge within reach, but limited capacity to interpret it.