The concept of the metaverse has recently exploded in the public consciousness. But its contours remain elusive. Is it merely an immersive virtual reality playground, one which Meta and other companies will angle to control? Is it simply the next generation of massive multiplayer online games? Or is it something more revolutionary? As Herman Narula shows, the metaverse is actually the latest manifestation of an ancient human tendency: the act of world building. From the Egyptians, whose conception of death inspired them to build the pyramids, to modern-day sports fans, humans have long sought to supplement their day-to-day lives with a rich diversity of alternative experiences. Rooting his vision in history and psychology, Narula argues that humans' intrinsic need for autonomy, accomplishment, and connection can now best be met in virtual 'worlds of ideas', in which users will have the chance to create and exchange meaning and value. Repositioning the metaverse as the growing set of fulfilling digital experiences, Narula shows the arrival of the metaverse marks the beginning of a new age of exploration with the potential to reshape society.