Recording carried at the exit turnstiles in Arco di Travertino subway station, where cyclically the sound of trains arriving and departing in the background accompanies the voices, footsteps, the mechanical exit turnstiles and the electrical at the entrance, and people leaving and arriving daily, crossing this urban micro-boundary.

Recorded with a Zoom H4n.

Author: Marcello Liberato
Date: 22/10/2013