By using a Microsoft Kinect and an LED Cube, you can point the camera at a very crude ("low resolution") object and recreate it in 3D space!
The resolution of your created object is limited by the number of Voxels (3D pixels) that your camera can see or your LED cube can generate.
In this situation, the LED Cube used is 4x4x4; so it only has 16 Voxels and can only recreate very simply shapes.
If you have a massive LED Cube (like 32x32x32 or 32768 voxel cube, https://www.youtube.com/watch?v=f1YNyQqbiF0
), you can make very high quality holograms.
Unfortunately, I didn't have an unlimited budget; this entire project was wired and coded (in Processing) in four days for Build18 (http://build18.org/
), an Electrical Engineering Hackathon at Carnegie Mellon.