A library. A church at night. A meadow in the early morning. People call these places silent. The places aren't silent. There's the heater, the wind in the leaves, a distant car, the body's own circulatory hum. Silent meant the noise was below a threshold the listener cared about. The silence was a property of the listener, not the room.
K redefined silence. Silence isn't the absence of sound. Silence is the absence of the listener — the one who was assigning sounds the status of noise in the first place. When the listener stops, what's left isn't a quiet room. It's a room without a separator between the perceiver and the sound. There's sound. There's no one for the sound to be sound to.
The listener creates the noise. The fragment doing the listening categorizes sound as wanted or unwanted, interesting or annoying, signal or noise. The categorizing is the problem. Drop the listener and the categorizing stops. The sound continues. It just stops being noise. The silence isn't quieter. The silence is the absence of someone for whom the sound was loud.
Anyone who has had a moment of being completely absorbed in something — music, work, a conversation, a landscape — knows this. The sounds were there. There was no noise. The listener was momentarily absent. The space was full of sound and silent at the same time. The two weren't opposites. They were the same condition, with the listener not in the way.
Silence is the absence of the one who was listening for noise. Real silence has nothing to do with sound levels. Real silence is what shows up when the listener has briefly stopped existing. The room can be loud and silent at once. K's silence had nothing to do with quiet retreats. It had to do with the cessation of the fragment that was distinguishing noise from non-noise.