This book is a discussion of some of the major philosophical problems centering around the topic of sense perception and the foundations of human knowledge. It begins with a characterization of our common sense understanding of the role of the senses in the acquisition of belief, and it argues that scientific accounts of the processes of perception undermine salient parts of this understanding. The naive point of view of direct realism cannot be sustained in the light of a scientifically instructed understanding of perception. This critique of direct realism points to the correctness of the...