The book treats themes like how to make "basic volumes', easy perspective, capture crowds, shade, how to treat light, colour etc. All ideas and observations related to make quick urban impressions.
If you want to do precise drawing and painting in a studio, this is not your book.
And as a bonus: the book contains 2 of my own drawings: one of a very quick roofdrawing in Liège, and the view over Hells Kitchen, New York.
This is still one of my favourite drawings, filled with fond memories of our trip to New York last year.