I believe he was talking about Zen and the Art of Motorcycle Maintenance: An Inquiry Into Values (
https://www.amazon.ca/Zen-Art-Motorcycle-Maintenance-Inquiry...).
It's a nice fiction book that goes into how different people view the world. At least that's what I've gotten out of it so far, I'm only about a quarter of the way through it so I might be missing some of the things it covers.