The 360° Gaze
Immersiveness for a movie, theatre production, even a book, requires you to look in one general direction; in front of you. Of course there can be changes and events happening that require you to move your head, but for the most part you look ahead of you. This is because you can only see what is being shown in front of you.
In VR you have a 360° perspective, just like real life. Therefore, the creator must fill a wider environment with objects to sustain immersiveness. A lot of the time the creator will want you to look in a certain direction and will use audio or visual cues to get you to follow. This is not enough, however, as even if you follow the cues the mind is a curious thing and will wonder. As soon as you rotate even 1° from where they want you to be, if there’s nothing substantial to the environment in your view, then you lose your immersion. In turn, this makes for a bad experience.