The lock, by the Zakim Bridge. The lock separates the Charles River Basin from Boston Harbor. A path runs across the locks, over the sector gates.
The building is required to enable continuous pedestrian passage across the lock when th egate is shut and nautical passage through the lock when the gate is open. Each threshold, when open and functional, prohibits passage through the other. As such, the project is about the development of two crossing, mutually disruptive paths.
