That's not really true, Taly. 2D isn't like looking through a pane of glass, as you can focus and stereoscopically converge your eyes despite the glass -- it's transparent to those effects, and passes the full range of electromagnetic data. Simply looking past a transparent surface doesn't mean that what's behind it is projected onto the surface (which would indeed lose the same data that capturing a 2D image does). So 2D is not like looking through glass, at all.
Now, 3D photography is not the real world, either. Until the recorded image will adjust things like the plane of focus in reaction to the point your eyes are, um, focused (stereoscopically) on, and capture phase and vector information to cause your eyes to focus on something in front of or behind the screen, it's simply an illusion that's better than 2D projection.
The first part, changing the plane of focus, could be done by rendering custom images in real-time for each viewer while tracking their eye movements and using that as an input parameter to the next frame's rendering. So there, you're talking about VR goggles, VirtualBoy style.
The second part, engaging your eyes' focusing mechanisms, won't happen without full-on holography. And motion holography is pretty crazy to think about.
Now, I suppose there's a third option I haven't mentioned; and that's bio-modifications to allow for directly projecting the image onto your retina (or, for that matter, directly inject signals into the optic nerve, I suppose). We can project 2D images just fine, so if you bypass all the parts that our brain expects to have to engage to change the image coming in (namely, the focusing mechanisms), you don't have to construct a full holographic image just to have it collapsed back down to 2 dimensions on our retinas anyways. Then, as with the eye tracking adjustments of the stereoscopically displaced images, you can instead make your adjustments in real-time rendering based on tracking impulses to the muscles that control focus (or by tracking changes to the shape of the lens directly).
_________________ "Aaaah! Emotions are weird!" - Amdee "... Mirrorshades prevent the forces of normalcy from realizing that one is crazed and possibly dangerous. They are the symbol of the sun-staring visionary, the biker, the rocker, the policeman, and similar outlaws." - Bruce Sterling, preface to Mirrorshades
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