I didn't know about the trick per se before the pix, but there was a thing with the (regular pattern) wallpaper on the family's kitchen ceiling in Maryland--- if I looked up at itI could get this weird depth and glimmering, and it was like the ceiling was 2 feet higher than it was. None of the rest of the family could see it. Not that they tried, particularly, or seemed interested in what I was saying. Ha. Now that I think about it, that's one version of my childhood right there!
I noticed it with a dot-pattern fabric on the ceiling of our old volkswagen microbus when I lay down on the back seat on long boring drives. It made it look a couple of inches lower. It sort of means that your natural tendency was for your eyes aim to drift apart, while mine tended toward cross-eyed. Eventually I learned to get it to work both ways. In fact, when viewing your examples, my first inclination was to go cross-eyed, which gives an inverted effect, so I had to let my eyes drift apart, instead.
Okay, I'm a little jealous now. I have one lazy-ish eye, and can't go cross-eyed. The one eye just floats off away from the intended focus, as if on strike. I mean, you gotta draw the line somewhere, I guess, and that's where that eye draws it.
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