Flowing

Sennett, relating city form to the circulation of blood in the human body, writes: 'During the day, the human blood of the city flowed below ground into the heart; at night, these subterranean channels became veins emptying the mass out of the center'(Sennett, 1994:338)
Sennett, Richard (1994) FIesh and Stone, London, Faber.