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This is awesome, these little electronic coconuts call the airlines when the noise is too loud... - "Tripwire is a site-specific installation responding to the unique relationship between the Norman Y. Mineta San Jose International Airport and downtown San Jose, CA. Custom-built sensors hidden inside coconuts are hung from trees at several public locations to monitor noise produced by overflying aircraft. Detection of excessive aircraft noise triggers automated telephone calls to the airport's complaint line on behalf of the city's residents and wildlife. Documentation of noise incidents is archived for later analysis." [via] - Link.