Innovation or Invasion?
Ok, this creeps me out, but it's also pretty smart. BBDO Dusseldorf have utilised a technology present in military radios for a few years to create windows that talk to you. Yup.
Based on the insight that people sleep on public transport by leaning against the window, BBDO have "developed a special window for public transportation that uses a transmitter to silently release high-frequency oscillations that your brain will convert into sound."
Invasion of privacy, or clever innovation? Not really sure...