I believe mathematics as a field is really suffering because there is not much in the way of "Feynman"-style books. But people like John Baez and John Conway ha

I believe mathematics as a field is really suffering because there is not much in the way of "Feynman"-style books. But people like John Baez and John Conway have countered this trend somewhat. You should definitely try reading anything by these two. Conway does tend to be a bit too brief at times. And there's this book: "Conceptual mathematics" by Lawvere and Schanuel. It's unlike any other mathematics text I have found. Fundamental and easy to read: yes. Also leads up to some deep ideas in an intuitive way.