Holodeck
The Holodeck is a fictional device from the television franchise Star Trek which uses "holograms" (projected light and electromagnetic energy which create the illusion of solid objects) to create a realistic 3D simulation of a real or imaginary setting in which participants can freely interact with the environment as well as objects and characters, and sometimes a predefined narrative. In several series, holodecks are an amenity available to the crew of starships.