“inarguably symbiotic. The pulses of air by themselves do not constitute any sort of sound, which is obvious because 15-pulse air puffs remain silent no matter how many ears are present. Only when a specific range of pulses are present is the ear’s neural architecture designed to let human consciousness conjure the noise experience. In short, an observer, an ear, and a brain are every bit as necessary for the experience of sound as are the air pulses. The external world and consciousness are correlative. And a tree that falls in an empty forest creates only silent air pulses—tiny puffs of wind.”