This practical introduction to the techniques needed to produce high-quality mathematical illustrations is suitable for anyone having a modest acquaintance with coordinate geometry. The author combines a completely self-contained, step-by-step introduction to the graphics programming language PostScript with advice on what goes into good mathematical illustrations, chapters showing how good graphics can be used to explain mathematics, and a treatment of all the mathematics needed to make such illustrations. The many small, simple graphics projects can also be used in courses in geometry, graphics, or general mathematics.