Augmented reality showcase where invisible cubes hover inside a room and cast shadows on the walls. The user navigates via a conventional old-fashioned lamp in a very natural manner. After locating the individual objects through light and sound one could reveal the specific content of each cube. The contents presented in the prototype version of Lumen were extracts from videos by students of the University of Applied Sciences Augsburg, Department for Art and Design. The installation was developed within a team of nine students and shown at the Theater Augsburg in February 2007.