This is by far the best book on watercolor sketch techniques that I have read in the last year. The word urban in the title is something of a misnomer, because the book is for more broad than sketching on site. The book is a broad discussion of watercolor as an art technique, and is more thoughtful and deep than any that I've read on the subject. At the same time, it is applicable engaging. I highly recommend this book to anyone considering or pursuing watercolor painting as part of their artistic and creative endeavor