This text, written to acompany an exhibition of the same title at the Scottish National Portrait Gallery in Spring 1998, provides a non-technical introduction to the science of the human face and the psychology of face perception. Illustrated throughout, the book includes reproductions of portraits from the gallery's collections, as well as state-of-the-art computer graphics. Incorporating discussion of vision, communication, memory and recognition, sociobiology, and neuroscience, this is a broad-ranging introduction to the topic. The book should be of interest to anyone wishing to learn about the many ways in which the human face is important biologically, and how we perceive and recognize it.