What is the most poetic math book you've read ?

*Calculus* by Spivak.
Arguably not poetic but certainly more expressive than most math (be it popular or technical) books: (1) The character of physical law, Feynman; (2) what is the name of this book?, Smullyan.
Maybe not what you were looking for but please do take a look at _Gödel Escher Bach_ if you don't know about it.

If you are just starting with undergrad or are still in highschool you may also like _Burn Math Class and Reinvent Mathematics for Yourself_.
These aren’t textbooks, but Paul Lockhart writes beautifully about mathematics in *Measurement* and *Arithmetic*, both relatively short books about elementary topics.
Winning Ways for Your Mathematical Plays is so so beautifully written. Lots of whimsy, and it uses a lot of examples to explain the concepts (there are kind of like metaphors for the operations the authors introduce)
By far the most poetic math book I've read is Kato/Kurokawa/Saito *Number Theory 1: Fermat's Dream.*

Here's a quote:

"In the long history of mathematics, a number meant a real number, and it is only relatively recently that we realized that there is a world of p-adic numbers. It is as if those who had seen the sky only during the day are marvelling at the night sky. The mathematical scenery is competely different. Q_p emits „the light of prime number p“ in the night sky as if it were a star that we could not see because of the sun, or the real number field R, which emits „the light of real numbers“ during the day. Just as there are countless stars in the night sky, there is one  Q_p  for each p. What each star is to the sun is what each Q_p is to R. Just as we can see space objects better at night, we began to see the profound mathematical universe through the p-adic numbers."
Not sure if it's what you're looking for, but "Apology of a Matematician" sure gives some emotions
by
I can honestly say that I've never seen, nor do I expect to ever see, a book more uniquely written than Knuth's Surreal Numbers: How Two Ex-Students Turned On to Pure Mathematics and Found Total Happiness
Analysis 1 by Terrence Tao!

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