  This paper presents a design space of interaction techniques to engage with
visualizations that are printed on paper and augmented through Augmented
Reality. Paper sheets are widely used to deploy visualizations and provide a
rich set of tangible affordances for interactions, such as touch, folding,
tilting, or stacking. At the same time, augmented reality can dynamically
update visualization content to provide commands such as pan, zoom, filter, or
detail on demand. This paper is the first to provide a structured approach to
mapping possible actions with the paper to interaction commands. This design
space and the findings of a controlled user study have implications for future
designs of augmented reality systems involving paper sheets and visualizations.
Through workshops (N=20) and ideation, we identified 81 interactions that we
classify in three dimensions: 1) commands that can be supported by an
interaction, 2) the specific parameters provided by an (inter)action with
paper, and 3) the number of paper sheets involved in an interaction. We tested
user preference and viability of 11 of these interactions with a prototype
implementation in a controlled study (N=12, HoloLens 2) and found that most of
the interactions are intuitive and engaging to use. We summarized interactions
(e.g., tilt to pan) that have strong affordance to complement "point" for data
exploration, physical limitations and properties of paper as a medium, cases
requiring redundancy and shortcuts, and other implications for design.
