Liquid glass design paradigm only works on reprojected displays. Additive displays can't replicate the distortions along the edges of the elements for both optical focus reasons and because you can see through the element.
That's pretty much the conclusion of my article linked above, at least short term. When I worked on that AR device we experimented with a segmented electrochromic layer that could allow a mixture of see-through and pass-through, but it's far from mass-producible, and probably a dead-end approach for what Apple is trying to do.
kepano|8 months ago