In nature, adaptation processes have created bio-diversity. In today's world, where technology is embedded in so many systems, we are creating techno-diversity through similar processes of adaptation. A human being in 2006 is confronted with the multiple presences of other people, organizations and systems, in which technology plays a crucial role. In this study a distinction will be made between natural presence, mediated presence and witnessed presence. This study will focus on the relationship between these presences.