There's been an abundance of large holographic displays portrayed throughout science fiction literature and films in recent decades. These fantastical depictions often show large consoles surrounded by multiple people working together to manipulate floating images and data. Although the users appear to interact seamlessly with the 3D data, there is a nagging question that goes unanswered:
How do multiple people interact with a large 3D scene?
Perhaps the question seems trivial, but consider the following. Most 3D displays currently available are around the size of a microwave. When groups interact with these displays, although they each have their own perspective, they are essentially all seeing the same information. So even if one person zooms in on part of the image, all the users understand what is happening.