One of the least heralded tropes in the horror toolbox is the idea of wrong geometry, the idea that the shape of the world is just a little off. It's a trope that finds expression in that meme that presents people with obsessive compulsive disorder with an 89 degree angle. The idea of wrong geometry gets a work out in stories like The Haunting of Hill House, where walls are upright and doors are sensibly shut, or At the Mountains of Madness, where the city of the Great Race of Yith defies Euclidean notions of dimension and sanity. It's an effective trope because when it's done well, it's profoundly disorienting. Wrong geometry--specifically wrong geography--is at the heart of Lovely, Dark, and Deep (2023, directed by Teresa Sutherland), in which being lost in the woods is a gateway to more cosmic horrors.
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