As mentioned, the above enumerated points are ‘first thoughts’...i want to ponder further to see if any of them contradict each other.
Re: the book. I can’t remember!! Somehow I feel like it is probably one by Leonard Shlain. I found his book Alphabet and the Goddess enthralling at one point and then binged on everything he wrote.
From his wiki page: https://en.m.wikipedia.org/wiki/Leonard_Shlain
[..]His books include Art & Physics: Parallel Visions in Space, Time, and Light (1991),[3] The Alphabet Versus the Goddess: The Conflict Between Word and Image (1998),[4] and Sex, Time and Power: How Women's Sexuality Shaped Human Evolution (2003).[5][..]
I want to say it’s one of his for sure. It was beautifully written and I loved the words as much as the content. So I want to say that I am 90% sure it’s one of Shlain’s books!
If you remember the name of that book, I would love to read it!