system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Trek] How is the holodeck, which appears to be a small room when turned off, able to simulate wide open places, in which people are able to walk long distances?

For example, it has been turned into a wild west town, Mark Twain's San Francisco, and Dickens' London...
gpt
The "Floor" is made of forcefields on the holodeck. As the occupant walks around the forcefield slides under them like a treadmill , while projecting what should be around them , around them. Essentially each person in a holodeck, if they leave the simulated vicinity of each other are surrounded by their own personal hologram as they wander, when really they remain only a short distance apart.