"Unfilmable" for me is James Tiptree Jr.'s "Up the Walls of the World". Half the novella is spent on a gas giant inhabited by giant telepathic manta rays fartin

"Unfilmable" for me is James Tiptree Jr.'s "Up the Walls of the World". Half the novella is spent on a gas giant inhabited by giant telepathic manta rays farting jet fire. The other half is spent in the <body> of a solar-system spanning semi-material, invisible/ dark <creature-ship-machine> where all the protagonists are transferred as disembodied minds. The day is saved by a strong telekinetic/ telepathic computer programmer who merges with the <beast-thing-machine-of-the-stars> and a spontaneously arisen AI from Earth (early '70s too... It Came From The Mainframe). Put that in Foundation's movie reel and film it!