Artists do a number of things that are very useful. In this deceptively modest book, some of these things are described. This limited (and arbitrary) sampling is intended to emphasize how, in totality, the work of artists has a substance, spirit, and methodology different from that found in most other types of work. Highlights from the lives of seminal 20th-century artists are used to illustrate these six things. Seminal works by artists Marcel Duchamp, John Cage, Richard Serra, Christo & Jean-Claude, Donald Judd, and On Kawara are used to illustrate (in words only) these points. This book is highly recommended for parents of children thinking of embarking on a career in the arts, for policymakers confused about the function of art in society, and for artists suffering a bout of self-doubt.