This book will teach you how create three-dimensional forms on a two-dimensional surface in minutes.
What we will discover is that that brain processes patterns of dark and light to convey information about form. These are absolutely essential skill sets for the artist. If you already paint or draw, these exercises will help you clarify your skill sets and speed them up.
This book can be used alone, but you will get more out of it if you first work through the exercises in "How to Sketch Shapes".