When it say's "Stone, glass, concrete, and gravel, all we've got to keep us together... Overcast weather and underground travel," it means that once you're in general society and the workforce all that you have to link you to the people from the previous chapter of your life is your memories of average everyday things.
When it say's "Stone, glass, concrete, and gravel, all we've got to keep us together... Overcast weather and underground travel," it means that once you're in general society and the workforce all that you have to link you to the people from the previous chapter of your life is your memories of average everyday things.