Someone already mentioned “Zen and the Art of Motorcycle Maintenance”, so I’ll go with something I read last year, Carlo Rovelli’s, “Reality is Not What it Seems.” I don’t think I really ever grasped the concept of relativity fully until reading that book — at least the aspects of time. [edit: well, not “fully”, I’m sure — but at least a lot more than I have in the past.] At the same time I read the Dalai Lama’s, “Universe in a Single Atom”, which focuses on his love of science / physics, and was a very good pair to Rovelli’s book. It made me really think about the role of subjectivity in terms of Relativity. It also made me think about life, and consciousness, broadly. That led to the Dalai Lama’s other book, “A Profound Mind”, which helped me really understand the Buddhist concept of “Emptiness” for the first time.
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