I love to research history when trying to understand contemporary phenomenons and I recently came across a project on Berlin's Faitishe Records which has taken the act of acoustic surveillance and is doing just that. The release is named Uguisubari after an obscure historical phenomenon. GES, aka Jan Jelinek, makes tribute to a special kind of wooden flooring once used in Japanese temples and castles to amplify movement along its corridors for surveillance purposes. The mechanism of this mechanized floor is greatly satisfying; making use of iron nails at certain angles and their friction with the above wooden boards to create a chirping sound, poetically likened to the Japanese Nightingale. It is an interesting introduction to acoustic surveillance, and a bonus that it featured in Ian Flemming's 1964 James Bond story, but I'm not going to subdue it to an intellectual analysis.
The compositions yielded from his sound recordings are sublimely generous and embracing, so go on, have a listen and take heed to this lovely investigation.