I read about this book years ago. Well over a decade, at least. But out of print, of course.
But on my birthday, my two beautiful angels took me to Solid State Books to pick out a present and while randomly browsing, there it was.
It takes the form of an adventure story, with the narrator meeting a character similar to Professors Lindenbrock or Challenger, but everything driven by symbolic rather than scientific concerns. They are seeking a mountain which has an almost Cartesian reason for existing: it exists because something so necessary must. As you might have guessed, Daumal means ‘analogue’ in a pre-digital sense.
The book ends mid-sentence, the authors having apparently been interrupted by a friend’s visit and then dying before returning to his writing. He was in the middle of the story of a guide, living at the base of Mount Analogue, and how he broke the rules and was forced to remain at the base, rather than pursue a journey to the higher reaches.