A holodeck, in the fictional ‘Star Trek’ universe, is a simulated reality facility located on starships and starbases. It first appeared in the pilot episode of ‘Star Trek: The Next Generation,’ ‘Encounter at Farpoint,’ although a conceptually similar ‘recreation room’ appeared in an episode of ‘Star Trek: the Animated Series’ in 1974. In the timeline of the fictional universe, the concept of a holodeck was first shown to humans in an encounter with the Xyrillian race in the ‘Star Trek: Enterprise’ episode ‘Unexpected.’
The holodeck is depicted as an enclosed room in which objects and people are simulated by a combination of transported matter, replicated matter, tractor beams, and shaped force fields onto which holographic images are projected. Most holodeck programs shown in the episodes run in first person ‘subjective mode,’ in which the user actively interacts with the program and its characters. The user may also employ third-person ‘objective mode,’ in which he or she is unseen by program characters.
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The Daily Omnivore 