Hmm, I see that Francois has already replied...

But I think you need to decide what you mean by "fake". If you mean an"illusion" then - as you should know by now - stereoscopy itself is an illusion!

But your word "fake" implies that there is an intent to mislead. And, I guess you could put it that way - but I prefer to call it "art" or even an "artifact" - something that is created by man. (You may have noticed that I said some "artists" create this effect. And you have been complimentary about it.)

But, after saying that the white rectangle is the true window, you have somewhat missed the point that if your example image was projected, the black rectangle would be on the screen surface (where some misguided projectionists put the stereo window when they project with what would be the slide mounts (in film projection) exactly overlapping on the screen surface. The white rectangles in your example would be floating in space between the screen surface and the viewers.

Incidentally, doesn't that bring this rambling thread right back on topic? :-)

Bob Aldridge