But it does not stop there. The sense of touch and taste are also being worked on, but this requires a more sophisticated technology called holography where three dimensional forms and sounds are created. In the science-fiction series Star Trek: The Next Generation, "holodecks" are used by crewmembers to relax, perform, or educate themselves. Hundreds of diodes lining the floors and walls project perfect three-dimensional forms and sounds and myriads of tiny force field projectors provide these holograms with solidity, and replicators duplicate food and odors. Holographic technology has long been a reality in the inner or hollow earth. Sharula, a citizen of the inner earth city of Telos beneath Mount Shasta, and Alex Collier of the Andromedands both describe holographic technology where any part of the Earth's history or your own can be relived or experienced. Holography is the science of light and sound and of all the other senses. It may be that we ourselves are projections of some greater reality and that the entire material creation works on this same principle.