Knowledge and Reality brings together a selection of Colin McGinn's philosophical essays from the 1970s to the 1990s, whose unifying theme is the relation between the mind and the world. The essays range over a set of prominent topics in contemporary philosophy, including the analysis of knowledge, the a priori, necessity, possible worlds, realism, mental representation, appearance and reality, and colour. McGinn has written a new postscript to each essay, placing it in its philosophical context by sketching the background against which it was written, explaining its relations to other notable work, and offering his current reflections on the topic. The volume thus traces the development of McGinn's ideas and their role in some central philosophical debates. Seen together the essays offer a many-sided defence of realism, while emphasizing the epistemological price that realism exacts.