Why your brain loves a liminal space

There's a whole corner of the internet dedicated to photos of empty shopping centres, and the comments are always the same: "I've been here. I've never been here. I've been here in a dream."

That feeling has a name: liminality, from the Latin limen, threshold. Your brain treats thresholds differently from places. A corridor isn't somewhere you are; it's somewhere you're between. Strip the people out and the in-between-ness is all that's left, humming at you.

The research rabbit hole on this one is deep: place cells in the hippocampus, the uncanny valley of architecture, why dream geography is always slightly wrong in the same ways. We fell down all of it for the Liminal Worlds episode and came back with the best kind of answer, the kind that's mostly more questions.

The short version: your brain keeps a waiting room. Nobody asked it to. Aren't you curious what's in there?