Book excerpt: Are you still the person who lived fifteen, ten or five years ago? Fifteen, ten or five minutes ago? Can you plan for your retirement if the you of thirty years hence is in some sense a different person? What and who is the real you? Does it remain constant over time and place, or is it something much more fragmented and fluid? Is it known to you, or are you as much a mystery to yourself as others are to you?With his usual wit, infectious curiosity and bracing scepticism, Julian Baggini sets out to answer these fundamental and unsettling questions. His fascinating quest draws on the history of philosophy, but also anthropology, sociology, psychology and neurology; he talks to theologians, priests, allegedly reincarnated Lamas, and delves into real-life cases of lost memory, personality disorders and personal transformation; and, candidly and engagingly, he describes his own experiences. After reading The Ego Trick, you will never see yourself in the same way again.