As surgeons watch a three-dimensionalimage of the surgery, they move instruments that are connected to a computer, which passes their movements to robotic instruments that perform the surgery.
Holographic telepresence means we can record a three-dimensionalimage in one location and show it in another location, in real-time, anywhere in the world.
From the refractive index of each path it is possible-with the application of some suitably crunchy computing power-to produce a three-dimensionalimage.