To find out, they placed marmosets in opposite corners of a room in which they could hear but not see each other and recorded the exchanges that ensued. (sciencedaily.com)
Besides its heavy black goggles, the system includes a pair of wireless motion controllers shaped like cupholders on sticks, and two «lighthouse» towers that are placed at opposite corners of a room, shooting fields of lasers for motion tracking. (theverge.com)
Two «lighthouse» sensors track the Vive controllers and headset and when placed in opposite corners of a room can track a space that's 15 x 15ft. (digitaltrends.com)