That was a neat, practical suggestion Bruce!
More generally, inverted depth perception is surprisningly treacherous. Logically one would expect to see things inverted in their distance away from you, for example an apple should look hollow rather than convex, but one's brain does funny things about inverse clues when looking through a sterescope. Then again there is lighting. One's impression of lunar craters or erosion channels seen in aerial photographs, when misinterpreted because of confusing lighting, can be hellish hard to make sense of.
It gives an intriguing and eerie effect when a sculptor carves a hollow bust in white material, a sort of hollow cast of a face instead of a convex statue of someone's head. Suitably lighted and seen from a very modest distance, it looks like a surreally floating three-dimensional head, correctly convex instead of concave. However, shockingly, (though logically when one knows what is going on) as you inspect it while walking from side to side, the shift in parallax refuses to be denied, and the head seems to be turning in the wrong direction.
Probably there are examples of such sculptures to be seen on line, but I don't know where. However, I cannot imagine anything on a screen giving the same sense of uncanniness.
Hmmm... ray tracing...? Holograms...?