The interactive sound installations expressed by the public are often directed to the public 'human' and its entertainment. Few are, however, examples of works that seek to embed itself with a place and with its own heritage sound, becoming active nodes of an invisible network noise already exists. In this direction is, however, Blue Moon , an installation hidden on one of the piers of the southern part of Manhattan, which used the external sounds as activators of its compositional structure. This is made up of three 'tuning tubes' installed on North Cove Harbor that create chords and melodies in response to perceived sounds (helicopters, airplanes, ships, voices, waves, ferries, boats, etc.. Etc..). The processing sound is played through five Amps cube-shaped, semi-circle in the square in front of the pier, thus creating a real harmonic area that changes in real time in tune with the sounds of the city. Created by Bruce Odland and Sam Auinger (O + A), Blue Moon also takes into account the flow of the tides, modulating its shades together to the cycles of the moon. In this way, the sounds refract their presence, in a fluid alternation of phenomena that create a soundscape integrated in the boundary between natural and artificial.