Even as one of our primary senses, sound — what and how we hear — is largely unexamined and taken for granted. Not anymore. Sam Green’s film essay explores the phenomenon and impact of sound from a range of perspectives, delving into sound design, effects, technology, and music. Hardly a dry exercise, via prominent artists like Annea Lockwood and scientists like Edgar Choueriri, we explore how sound affects our emotions and stimulates memory.

Director Green and his colorful cast present an immersive study of sound in all its endless, wondrous permutations. Given how fundamental sound is to the human experience, we have to wonder what took so long. “32 Sounds” really benefits from the commentary of fascinating, offbeat characters like avant-garde composer Lockwood, now 82, who basically steals the film. Note: it’s best seen (heard?) over good, noise-cancelling headphones, as sounds come at us from different directions throughout. (And yes, we hear about the invention of stereo). Often we are told to close our eyes and just listen, a healthy life suggestion overall. Looking to stimulate your ears, brain and soul? Envelop yourself in “32 Sounds.”