Visual book of real analysis
I have always been looking for good mathematics books that build intuition through visualization.
I recently found Mathematical Analysis I by Claudio Canuto and Anita Tabacco.
The book really uses a lot of graphics to convey the meaning of mathematical formulas. More than other textbook I've looked at. It's not proofs without words because it does contain lots of words, but it's clearly "illustrated concepts" in mathematical analysis.
Here are some examples. The book contains many more.
The effect of scaling
A classical result about convergence
Taylor polynomials
Domain and mappings
I really like James Callahan's Advanced Calculus: A Geometric View. Only after reading this book did I really understand what was going on with the change of variables formula when doing integration. There are many nuggets of intuition in this book, and they are explained with plenty of diagrams. Also, consider it to be a supplementary textbook for whichever main book you might be using to learn real analysis.