The hollow-face illusion is quite interesting. When I was looking for pictures to decorate this project, it was actually quite difficult to tell if the picture was concave or convex if there weren't other visual cues in the image. I'm not a sculptor myself, so the hollow-face illusion isn't particularly useful in what I do, but the idea of our brain tricking us and having us perceive something different than from reality is very present in media, particularly in more representative works, since idea is to get the viewer to see something that might not actually be there.
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