I don’t own books that you could call coffee table books (also I prefer coffee in cups rather than tables) but this one has the glossiest paper and a cover that looks like it has been gift wrapped.
This is a book about Sangaku (https://en.m.wikipedia.org/wiki/Sangaku) – a topic about which I knew nothing. Reading about it briefly for the first time, I had one of those ‘how did I not already know about this!’ moments. I also, coincidentally, had money to spend on books! So I bought this as a present to myself.
The concept is/was that geometry problems or solutions to problems as a temple offering. How delightful is that! It’s symbolic but also requires personal effort, so it has many aspects of a kind of ritual sacrifice or penance (to cast in Western religious terms) but also very meaningful in other ways.
The idea of mathematics as belonging primarily with the sciences and materialist domains is a relatively new one. Sangaku is just one example of how mathematics often intersects with spiritual aspect of human inquiry as well as aesthetic ones.