The murmur, the song that issues audibly from the phone as soon as any receiver is lifted in the village, is the Castle’s only acoustic manifestation. It is indistinct and, moreover, non-linguistic, a music composed of words gone back to their source in pure sonic matter, prior to and stripped of all meaning. The Castle communicates with outside world through a continuous, indecipherable sound.
— Roberto Calasso, K. (tr. G. Brock)
Notes from a Room 