We claim that presence is elicited most strongly when information is presented as an inhabitable, external world. Technical developments that permit this, such as the creation of interactive, immersive virtual environments herald a profound change in how people relate to sources of information, and how they communicate. This change has psychological, social and cultural effects. It has been claimed that in many ways, our relationship to information becomes that of our ancestral, pre-literate relationship to the physical world. By this view, we are heading for a post-literate future of body-based communication. But this view is too simple, since information must serve a variety of purposes, and how much presence is desirable in a communicative situation depends on many factors, including the communication devices available, the intended use and the context of use. In addition, differences between individuals, such as personality, as well as physical and psychological state, will affect how readily presence is invoked and also its impact on the individual concerned. In this chapter, we expand on the general notion of presence as a dimension of communication, and how this perspective can inform an understanding of designed variations in presence as a function of use, context, and individual psychological factors.