Quick Review: Jorge Luis Borges, Fictions
This should actually be called sci-fi in today's terminology, although it is simple, straightforward fiction written in an era when sci-fi meant outrageous space opera. Borges writes about totally fascinating "what if"s that bring philosophy down to earth. Themes in this book are repeated in everything else he writes, but he does it here first and best. Here's a story from Fictions, worth your time:
http://jubal.westnet.com/hyperdiscordia/library_of_babel.html