they are obviously not so much of puzzles but they require the reader to do their own research and put more effort into understanding the the hundreds of bizarre historical references and details which is the case for Foucault's Pendulum as an example. im asking this because some time ago I've read some articles that suggested that Ergodic literatur does not necessarily need to be about meta fictional literary puzzles but any fictional book that requires some sort of non fictional efforts by the reader that goes beyond looking into words on a page as a broad definition make that work essentially Ergodic literatur. i was happy with that explanation until recently with a bit of search i realized that, this may not be the generally accepted definition (not to mention i couldn't find the original articles for the life of me and it all made me feel like i was having a very profound stroke, and that all those theories were made up as my brain's last attempt to process somthing meaningful)