  The last two decades have seen the emergence and steady development of
tangible user interfaces. While most of these interfaces are applied for input
- with output still on traditional computer screens - the goal of programmable
matter and actuated shape-changing materials is to directly use the physical
objects for visual or tangible feedback. Advances in material sciences and
flexible display technologies are investigated to enable such reconfigurable
physical objects. While existing solutions aim for making physical objects more
controllable via the digital world, we propose an approach where holograms
(virtual objects) in a mixed reality environment are augmented with physical
variables such as shape, texture or temperature. As such, the support for
mobility forms an important contribution of the proposed solution since it
enables users to freely move within and across environments. Furthermore, our
augmented virtual objects can co-exist in a single environment with
programmable matter and other actuated shape-changing solutions. The future
potential of the proposed approach is illustrated in two usage scenarios and we
hope that the presentation of our work in progress on a novel way to realise
tangible holograms will foster some lively discussions in the CHI community.
