Twenty years ago, a polymath prophet named Edward Tufte self-published an incendiary book, The Visual Display of Quantitative Information. It forever changed how a certain species of white-collar professional viewed the world. As a DNA-tested, confirmed member of the species homo visualis, I can tell you that his book, and successors such as Envisioning Information, taught me how to create strong, effective statistical graphics. Tufte introduced the concepts of chart junk, the data-to-ink ratio, small multiples and sparklines. He argued forcefully and persuasively that designers of statistical graphics need not condescend to their audiences. And perhaps most important, he inspired a generation of authors, professionals and scientists — call them “Tuftees” — to strive for simplicity, clarity and honesty in their representations of data.