A compelling read, but I was never quite sure what facts would end up being important to the plot.
(FWIW, the pinball fact was not)
The plot is seldom the main point in literature, especially good literature -- it's mostly a vehicle to convey thoughts and observations about life, the universe and everything as opposed to the end goal (as in a (common) detective story or a pulp thriller).
Plus it's as brilliant a takedown of conspiracy-theory-thinking as ever the world will see.
How does it compare on that score to The Illuminatus Trilogy[1], written more than a decade before Eco's book?
Foucault's Pendulum is a very smart guy who knows a lot, pointing out that, if you peel an onion you won't find anything in the center.
Your comment however was arrogant and uncalled for.
I actually listed all the words I had to look up on a 3x5 index card and used it for a bookmark. I no longer have it but I definitely remember "numinous" was on there, along with many others.
That's because it keeps jumping from subject to subject, revisiting some, and sometimes even repeating the same information in different ways. I was completely lost after a while, but I didn't have the heart to start from the beginning. It's a very big book.
I did enjoy it though, in a way because I got so lost in it, that after a while it didn't make any difference where I was and what I'd read. It was a bit like floating into someone's dreams.
Also, it put me off my New Age books for ever - you know the ones, Alistair Crowley, Dion Fortune and the like. I'm much happier with technology than magic, thank you. Thank you professor Eco, that is.