Zen Mind, Beginner’s Mind by Shunryu Suzuki is a rather intricate but deep view into the mindscape of what the ‘Zen Mind’ entails. Given that this book isn’t exactly for those in the nascent stages of Zen Buddhism, it can be quite enigmatic in some spots.
https://www.amazon.com/Zen-Mind-Beginners-Informal-Meditation/dp/1590308492

