
Thousands of years in the future, humanity is no longer alone in a universe where a mind's potential is determined by its location in space, from superintelligent entities in the Transcend, to the limited minds of the Unthinking Depths, where only simple creatures, and technology, can function. Nobody knows what strange force partitioned space into these "regions of thought," but when the warring Straumli realm use an ancient Transcendent artifact as a weapon, they unwittingly unleash an awesome power that destroys thousands of worlds and enslaves all natural and artificial intelligence. Fleeing this galactic threat, Ravna crash lands on a strange world with a ship-hold full of cryogenically frozen children, the only survivors from a destroyed space-lab. They are taken captive by the Tines, an alien race with a harsh medieval culture, and used as pawns in a ruthless power struggle.
Book of the New Sun series by Gene Wolfe. (Highly recommended)
A Fire Upon the Deep (Either you like the Tines or the Skroderiders)
Tlön, Uqbar, Orbis Tertius by Jorge Borges (Is reality imbued with our ideas?)
Conan the Barbarian by Robert E. Howard (Not unlike "the Greeks" of modern fic)
John Carter of Mars by Edgar Rice Burroughs (perhaps the first true modern fic)
Understand by Ted Chiang (Most of his short stories are good, or provoking)
Xeethra and the Zothique Cycle by Clark Ashton Smith
The Dying Earth by Jack Vance
For me the (probably incomplete list) is:
Connie Willis: Doomsday Book (three times)
Neal Stephenson: Cryptonomicon, Anathem, Quicksilver, The Confusion, The System of the World (twice or three times)
Frank Herbert: Dune (three times)
Tolkien: Lord of the Rings (three times)
Stephen King: Salem's Lot, The Shining, It (three times each)
Stephen King & Peter Straub: The Talisman (twice)
Vernor Vinge: A Deepness in the Sky, A Fire Upon The Deep, Rainbow's End (each twice)
Tracy Kidder: The Soul of a New Machine (twice)
Larry McMurtry: Lonesome Dove (twice)
Ross Thomas: Chinaman's Chance (twice)
William Gibson: Neuromancer, The Peripheral, Agency (each twice)
They have a special place in my heart. Vinge didn't write much, but what he did write I think is very special indeed.
I've also taken to buying hardbacks of my favourite books from ebay.
https://www.goodreads.com/en/book/show/77711.A_Fire_Upon_the...
https://www.goodreads.com/book/show/226004.A_Deepness_in_the...
I recently described finishing Fire Upon the Deep as saying goodbye to a very dear friend. A great book.