Towards Pen-based Annotation Techniques for Tangible Magic Lenses Above a Tabletop

Previous Work. We previously investigated the use of tangible magic lenses to explore complex spatial information spaces by moving a mobile lens through the space above a tabletop environment. Our system was implemented as a lightweight piece of pressboard (PaperLens) whose position and orientation was tracked via infrared (IR) cameras. A ceiling-mounted projector was used to project visual content onto the lens’ display. In our approach, we explicitly mapped the height of the mobile lens onto distinct tasks of interaction in order to support the exploration of different types of data, e.g. the exploration of volumetric CT scans.