Comment by zeta0134

You walk down it. Extend your hands, see if they pass through the walls, etc. If you've never used VR before this can be hard to explain with words, but "it's like you're really there" in terms of spacial presence at least. Something about being able to turn your head and have the camera perfectly mirror that movement helps your brain with all sorts of depth cues that are harder to pick up with a flat panel.