This sound, it rolls and folds a distinctive wash, and it breathes another sort while invisibly wrapping you up.
This sound, it is of no mass, nor physical source, tis no fluid nor gas, no friction, nor wind, and it is, it lives.
This sound is motionless resonance, where not of sense, yet sensed, perceived, save reason, a seeing sound, yet unseen.
It is in you, this hum without, about and among you, your expressionless speaking silent sound, your familiar and absent companion.

image by Peter Skwiot Smith, found at Design Work Life