As a particle of the atmosphere is never lost, so sound is never lost. A strain of music or a simple tone will vibrate in the air forever and ever, decreasing according to a fixed ratio. The diffusion of the agitation extends in all directions, like the waves in a pool, but the ear is unable to detect it beyond a certain point. It is well known that some individuals can distinguish sounds which to others under precisely similar circumstances are wholly lost. Thus the fault is not in the sound itself, but in our organ of hearing, and a tone once in existence is always in existence.

• Florence McLandburgh, The Automaton Ear, 1873

We got up to our usual business in June's brain melting heat. Perhaps it was our heat-augmented cognition that caused one of us to pour a batch of cornstarch and water on a bare speaker wired up to a function generator and an amplifier. No matter the cause, ~8 of us gathered on this night to blast sound waves in every which way, (perhaps) lingering there forever...

Fight war, not wars. Ⓐ + ☮︎