We are all connected, one unto another.
A bulb in my hallway has burned out. I keep fitting new bulbs into the socket. Nothing happens.
Then I find in my hallway a switch I have never noticed before. I flick it on and off, on and off. Nothing happens.
Three blocks away, in their apartment, a wife calls to her husband, “Henry! Come quick! The lights seem to be going on and off for no reason.”