I found this in Sherman's in Bar Harbor. I had seen a similar book by the same authors on Statistics that I didn't like much, but this is brilliant. In my limited experience, Calculus was a collection of techniques that I memorized in order to solve a bunch of changing rate story problems in the classes that I took as an undergraduate, but would suddenly change into something similar but different when I used it in Physics or in Statistics. This book concentrates on the underlying concepts of Calculus using cartoons. It has an historical perspective, including both Newton and Leibnitz as characters, and it includes enough explanation of technique so that it ties everything to my experience. I wish I had it 50 years ago.