It’s a bit tricky to pin down conceptually. Nostalgia is definitely one piece of the puzzle.
“Liminal space” images are images of places which defy expectations about the purpose and use of a space; when you can say “This place had an obvious and specific purpose, but that purpose is not present in the image”, then it’s a good bet that this is what people would call liminal. Abandoned malls are places meant for shopping, but no one is shopping. A library with no books in it. Stuff like that.
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