The Map Behind the Wall

Listen to the audio version &#xA; A light switch is one of the great civilized promises. You press a small piece of plastic, and somewhere in the walls a hidden arrangement of copper, glass, fuel, labor, and long-ago decisions agrees to give you light. &#xA; Most of the time, we do not need to know the route. That is the point of a house. It lets us make breakfast without taking an exam in…