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

Mobile lenses above a tabletop are a powerful instrument for the quick exploration of spatial or volumetric information spaces (e.g. MRT data). During exploration, users occasionally want to capture and annotate parts of the dataset. However, returning to previously visited and annotated locations within such datasets can be tedious or even ineffective. To tackle this problem, we present a set of annotation techniques that are based on the combination of mobile lenses and digital pen technology. We particularly focus on two issues: (I) creating annotations and (II) finding back to locations that have been annotated previously. Author Keywords Spatially aware displays, digital pen interaction, multi-layer interaction, three-dimensional space, tangible interactio