This book initiates the conversation about the metaverse in science and practice. What will the metaverse look like? What is it about? Where do we stand? What do we need? Where is the journey going? To begin with: Is the metaverse an idea or a promise? Ralf T. Kreutzer and Sonja Klose try to make the vision tangible and imaginable. As with the Internet, it is difficult at this point to predict which developments and technologies will be created and combined by which individuals and companies and in what way. The authors take you by the hand and recommend: Don't ignore these developments!...