This book is a defence of perspectivism the age of post-truth. At the crossroads of science, art and philosophy, it unearths a tradition that we must rediscover: the point of view is not only what divides, it is also what is shared. Today, perspective is associated with individualism and personal viewpoints. But in an age of post-truth, the only robust answer to relativism lies in fact in reappraisal of perspectivism. In discussion with contemporary new realisms of various sorts, the book makes a case why perspectivism alone can avoid us falling back into epistemological naivetés. A journey into the history of optics, art, philosophy, and social psychology, the book unearths the forgotten tradition of perspectiva communis, which makes perspective the vector of a common horizon. This book argues that vision is never immediate. Rather, that to see through is the key to understanding the perspectival operation. We never see by ourselves—all seeing must pass through something other than itself, through the mediation and the detour of an apparatus or the witness of a third party. Besides the theoretical framework for this new approach to perspective, the book presents a series of case studies ranging from innovative interpretations of classical authors and key moments in the history of art—from ancient painting, trompe l’oeil, and Brunelleschi’s experiment in Renaissance Florence—to the issue of perspective in the work of contemporary artists such as Robert Smithson. The Share of Perspective will be of interest to scholars and advanced students working in aesthetics, phenomenology, art history, and the history of sciences.