Christian Stein studied German and Computer Science, received his doctorate in Literature and has since been active at the interface of the humanities and technical sciences. At »Image Knowledge Gestaltung« he was leader of the project »Architectures of Knowledge« and co-founder of »gamelab.berlin«, which deals with the game as a cultural technique. In this context, he has focused on the development of game prototypes and VR applications for exhibitions and medical contexts. In addition, Christian deals with artificial and natural languages as well as an interdisciplinary theory of the interface, to which he is currently completing his habilitation project. At »Matters of Activity« in the project Object Space Agency Christian is working on the conception and implementation of forms of interaction which are intended to make objects and people both active and experienceable in a new way.