The Black Mirror Hints

What can be heard but not seen, and won't speak until spoken to?

  • 1 of 5: "...won't speak until spoken to" certainly indicates something that is reactive -- i.e., that requires some "input" first.
  • 2 of 5: And it doesn't actually "speak"...
  • 3 of 5: ...but instead repeats sounds.
  • 4 of 5: Especially in large, open, empty rooms.
  • 5 of 5: The answer is ECHO.