3D will always have one major problem, and that is when you look as a human being, normally only one eye looks dominantly at things. The other eye is mostly ignored. And only in specific cases – if somebody approaches you – all of a sudden the brain starts to use both eyes for establishing depth of field and understanding space. But it tires you when you are a spectator at a 3D movie, because you are forced to see with two eyes and two images superimposed.