It's kind of a cliche at this point, but Structure and Interpretation of Computer Programs really blew my mind when I read it in high school. I didn't finish it

It's kind of a cliche at this point, but Structure and Interpretation of Computer Programs really blew my mind when I read it in high school. I didn't finish it "cover to cover" back then, but it was my first proper introduction to symbolic computation, recursion, and the concept of a metacircular evaluator was really fascinating. It inspired me to implement a simple Scheme-like interpreter in C# for my high school science project, and really put me on my adult path.