The goal of the thesis is to create novel collaborative systems that support remote collaboration within and across large interactive spaces. These new systems will enable users not only to see each other as in standard videoconferencing systems, but also to share the content they work on, to act together on this content and to perceive nonverbal cues in order to support richer interaction and social presence (the feeling of “being together”). The thesis will explore both the case where users interact together within the digital world, e.g. collaborative interaction on the same datasets, and the case where users interact together in the physical world through the computer, e.g. remote design or fabrication of physical objects.