This book is a defense of perspectivism in 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 a reappraisal of perspectivism. In discussion with contemporary new realisms of various sorts, this 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, this 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, to see through is the key to understanding the perspectival operation. We never see by ourselves—all seeing must pass through something other