During the Pre Studies it was possible to test Microsoft HoloLens mixed reality smartglasses. The tutorials were helpful to teach the gestures and gaze paradigms in order to use the HoloLens in the Main Study. Here is a video of using HoloLens with basic holograph objects:
Video: Introducing Microsoft HoloLens Glasses and use cases.
Video: Office Gadgets with HoloLens. The models can be small like these ones.