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Why could several people use a CAVE virtual reality system together?

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early head-mounted display device — virtual reality Early head-mounted display device developed by Ivan Sutherland at Harvard University, c. 1967.

A Cave Automatic Virtual Environment (CAVE) allows several people to use the system together because it is designed as a room-scale virtual reality theater rather than a personal workstation.1

Unlike systems that require bulky, individual head-mounted displays, a CAVE projects images onto the walls of a cube-shaped space. This configuration enables multiple users to walk freely within the room while wearing lightweight stereoscopic glasses. Because the environment is a shared physical space, participants can naturally observe the same virtual imagery, discuss what they see, and interact with 3-D objects collectively, fostering a collaborative experience that is more social and less isolating than traditional VR setups.1