The field of information visualization is still relatively young. The milestones that mark its history can be listed and briefly described with the exhalation of a single deep breath. Only a few information visualization events today can be anticipated with guarantees of significance, including:
- IEEE’s annual InfoVis Conference, which always provides glimpses of a few new and promising innovations
- Edward Tufte’s seminar, if you’ve never been before, which will encourage you to strive for excellence
- A presentation by Hans Rosling, which will inspire you to use visualization to solve the world’s problems
- A new major release of software from Tableau or Spotfire, which will convince you that visualization can reach a broad audience when properly designed and commercially packaged
I hope that my workshops fall into this category as well, with the guarantee that you will walk away having learned many useful, simple, and practical skills.
At least one more event belongs on this list: the publication of a new book by Colin Ware. When Colin told me late last year via email that he had a new book on the way entitled Visual Thinking for Design, I began counting the days. As far as I know, Colin is the world’s leading authority on visual perception in terms of how our knowledge of its mechanics, strengths, and limitations can be applied to information visualization. Much of what I know about visual perception, I learned directly from his work. I’ve been relying on his book Information Visualization: Perception for Design for years, quoting it often in my own work. Based on its exceptional quality—not only its excellent content, but also Colin’s ability to express it clearly—I knew that the release of his new book would constitute a major information visualization event. I finally got my hands on a copy a couple of weeks ago. My high expectations were not disappointed. In fact, they were exceeded.
Visual Thinking for Design is intentionally less comprehensive than Information Visualization: Perception for Design, for it is more focused on visual perception as a process that can be tapped to help us think more effectively. This new book is also accessible to a broader audience of readers. Anyone interested in how visualizations should be designed—both the pictures and interactions with them—to help people discover and understand the meanings that live in data, will find this book comprehensible and a delight to read.
Colin begins by introducing the term “active vision.”
Active vision means that we should think about graphic designs as cognitive tools, enhancing and extending our brains. Although we can, to some extent, form mental images in our heads, we do much better when those images are out in the world, on paper or a computer screen. (Preface, p. ix)
He goes on to explain why this way of understanding visual perception is important.
The active vision revolution is all about understanding perception as a dynamic process. Scientists used to think that we had rich images of the world in our heads built up from the information coming in through the eyes. Now we know that we only have the illusion of seeing the world in detail. In fact the brain grabs just those fragments that are needed to execute the current mental activity. The brain directs the eyes to move, tunes up part of itself to receive input, and extracts exactly what is needed for our current thinking activity, whether that is reading a map, making a peanut butter and jelly sandwich, or looking at a poster. Our impression of a rich detailed world comes from the fact that we have the capability to extract anything we want at any moment through a movement of the eye that is literally faster than thought. This is automatic and so quick that we are unaware of doing it, giving us the illusion that we see stable detailed reality everywhere. The process of visual thinking is a kind of dance with the environment with some information stored internally and some externally and it is by understanding this dance that we can understand how graphic designs gain their meaning. (Preface, pp. ix and x)
With these words, Colin begins his own elegant dance of explanation, taking the reader step by step through the process of visual perception, pointing out in practical terms along the way how this knowledge can be applied to information visualization and also other thinking processes, such as scribbling on a napkin to explore ideas.
It is always tempting, when reviewing a book this good, to say too much out of sheer excitement. I’m not going to give into this temptation, because I don’t want to spoil any of the fun that you’ll have reading this book from beginning to end with little advance knowledge beyond the fact that it is an extraordinary work. Everyone interested in information visualization should read this book. Not just read it, but mark it up with lines, comments, and even diagrams in the margins, and then keep it close at hand for easy reference and review.