Let’s go back to the bush for a second. Back then, you were immersed in an ultra peaceful 360° soundscape. Most of the noises around were soothing sounds: wind in the leaves of high trees, a river nearby, small streams or friendly grass eating animals munching in the near vicinity, relax and safe in the knowledge that since you had some mouthfuls of berries not long ago they were not in the immediate danger of you hitting them with a large rock. You got the idea, your soundscapes back then were quiet and mostly harmless, most of the time. This by the way is possibly the exact reason why almost any self aid, religious or self development book at hand will suggest, recommend or even urge you to save time for walks in the forest as much as you possibly can.