Object Lessons is a series of short, beautifully designed books about the hidden lives of ordinary things. Glasses are among the oldest and most commonplace prosthetics we have invented. But what does it mean to wear glasses? There is more to the answer than correcting vision. Glasses alter, enhance, and shield the way that we view the world, and the way the world sees us. Everyone has encounters with glasses, passively or actively, from reading glasses to sunglasses. At times they are the main identifiers in a face (think John Lennon), and they signify extremes from nerdy and brainy to cool and sleazy. They are alternately the most mundane of things on our bodies and potentially the most glamorous. Adam Geczy explores this most pervasive and accessible accessory and shows that it is both a conduit to and a barrier between ourselves and the world outside.