James J. Gibson's numerous theoretical and empirical contributions to the understanding of how people perceive were innovative, controversial, often radical, and always profound. Many of his ideas revolutionized the science of perception, and his influence continued to grow throughout the world. This book, originally published in 1982, is a collection of the most important of Gibson's essays on the psychology of perception. Drawing from the entire corpus of Gibson's papers, the editors have selected over thirty works dealing with such diverse topics as ecological optics, event perception, pictorial representation, and the conceptual foundations of psychology. The editors' goals in preparing the volume were twofold: first to provide easy access to Gibson's most outstanding papers and talks, including some that were previously unpublished; and second, to provide an intellectual biography of Gibson by including essays from the different periods of his career.