This audio features the distinctive sound of a whistle being created from a synthetic bottle. The unique tonality of the whistle is reminiscent of a pipe, hinting at the hollow, resonant qualities one might expect from such an instrument. The listener can almost envision the person blowing into the bottle, manipulating their breath to produce a range of pitches. The sound has a glass-like clarity to it, evoking images of a delicate glass bottle rather than a synthetic one. The blowing technique used brings a certain musicality to the sound, transforming the simple act of blowing into a bottle into a mesmerizing audio experience.