In this day and age, cyberspace may seem an unlikely gateway for the soul. But, as science commentator Margaret Wertheim argues in this volume, cyberspace has become more and more a repository for immense spiritual yearning. Wertheim explores the underpinnings of this mapping of spiritual desire onto digitized space and suggests that the modem today has become a metaphysical escape-hatch from a materialism that many people find increasingly unsatisfying. In a journey through the history of space, Wertheim traces the combined story of physical space and spiritual space from the Middle Ages to the present, and shows how reality has come to be defined as the exclusive domain of the physical world. It is against this profoundly materialistic world that Wertheim persuades us of the appeal and ultimate failure of cyberspace to satisfy spiritual needs.