Have you heard 'the Hum'?

For decades, hundreds of people worldwide have been plagued by an elusive buzzing noise known as "the Hum". Some have blamed gas pipes or power lines, others think their ears are faulty. A few even think sinister forces could be at work.

Sound mirrors

A forerunner of radar, acoustic mirrors were built on the south and northeast coasts of England between about 1916 and the 1930s. The ‘listening ears’ were intended to provide early warning of incoming enemy aircraft.

Jailhouse radio - Louisiana State Prison radio station KLSP (1990)

Out of the small studio in the one-story brick control center building of the Louisiana State Penitentiary at Angola, KLSP broadcasts from noon until midnight, seven days a week.

The Encounter between Guattari and Berardi and the Post-Media Era

Felix and Alice in Wonderland: The Encounter between Guattari and Berardi and the Post-Media Era
by Michael Goddard

This is not to say that Guattari’s post-media era has nothing to do with network culture, whose development can certainly be seen to realise and confirm some aspects of the rhizomatic, machinic thought Guattari developed alone and with Gilles Deleuze. Rather this link will be shown to be more complex and to pass via other fields of media experimentation and thought, especially that which emerged around ‘popular free radio’ in Italy in the 1970’s and which was strongly associated with Guattari’s friend Franco Berardi or Bifo.

Tetsuo Kogawa interviews Félix Guattari

Three interviews from 1980-1981 (English and French)

1982 Datsun Voice Warning Box Used Tiny Phonograph Record, Just Like Moon Base Robots

That's when I found an intriguing box labeled "Audible Warning - Don't Drop" under the dash of a 1982 Datsun 810 Maxima.