alt Hacker NewsCalling liminalism the "defining" aesthetic of our time is a bit much (though I get the article is trying to hitch its wagon to the Backrooms, aka the "current popular thing"). It's an aesthetic microniche, about as popular as vaporwave, or cyberpunk, grunge, or Y2K (think flip phones, bulky plastic cameras, etc.). There's a ton of these, and some are surprising: for example, there's even been a relatively recent revival of the "old-money" aesthetic, especially motivated by fashion brands like Rowing Blazers, etc.
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The same art world (or more specifically the "Consumer Aesthetics Research Institute") also named "Frutiger Aero" the defining aesthetic of 2000s, even though it was really only seen in a few places (Aqua aesthetic is very different from Aero). All of this should probably be taken with grains of salt.
I thought similarly, but the article actually was published prior to Backrooms movie release and popularity, though there is a nod they were aware the concept was being optioned to A24. Though I agree, “defining” might be a bit strong.
Liminialism is way way more popular these days than cyberpunk or anything like that. Please go talk to a group of teenagers if you don't believe me.
All of the ones you list have one thing in common: They have at least some root in nostalgia.
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Also, for places metro stations/gyms it's more of a maintenance and hygiene thing rather than an aesthetic. I'm currently in Paris so I've seen a ton of metro stations recently and really, unless you arrived in the dead of night so that you could snap an empty photo like the one in the article, there's nothing much liminal about them. A space can't be liminal if it's packed with people, buskers, beggars, dogs, etc. In that case, what it is is minimal or functional.