Jonardon Ganeri explores philosophical reflections from many of the world's intellectual cultures, ancient and modern, on how each of us inhabits an inner world. In brief and lively chapters, he ranges across an unexpected assortment of diverse thinkers: Buddhist, Hindu, Islamic, Chinese, and Western philosophy and literature from the Upaniṣads, Socrates, and Avicenna to Borges, Simone Weil, and Rashōmon. Ganeri examines the various metaphors that have been employed to explain interiority--shadows and mirrors, masks and disguises, rooms and enclosed spaces--as well as the interfaces and boundaries between inner and outer worlds. Written in a cosmopolitan spirit, this book is a thought-provoking consideration of the value--or peril--of turning one's gaze inward for all readers who have sought to map the geography of the mind.