Containing the edited research papers resulting from an ambitious, cross- disciplinary research project, this volume examines the spatiality of virtual inhabited 3D worlds - virtual reality and cyberspace. (Three other volumes look at Interaction, Staging and Methodology.) It is about the communication spaces emerging at the Internet and supported by special 3D interfaces. It is also about the virtual spaces created by virtual reality hardware (CAVEs, panoramic screens, head mounted display systems etc.) and software. Virtual Space: Spatiality in Virtual Inhabited 3D Worlds is interdisciplinary. It deals with philosophical, psychological, communicational, technological and aesthetic aspects of space. While philosophy raises the question concerning the ontology of