The main point from this book is: visual presentation has become a language, similar to the conventional written or spoken language. We have entered an era in which learning to draw is equally or even more important compared to learning to write. Basically there are three key components of the visual language, namely, word, shape and image. Word conveys something accurate and detailed. Shape serves as the main expression of the presentation ideas. And image is another important channel of information (showing something words cannot show clearly and shapes cannot contain). Without any of them we cannot form a language. The book also shows that throughout human history, there are numerous examples as how people used visual language to convey certain types of information.