Wisl is a unique minimalistic redesign of the classic american whistle. Any geometry that isn't detrimental to its function as a whistle has been removed. By holding Wisl's sides, the user completes the inner cavity where air vortexes create a whistling sound. Due to it's open design, Wisl can't get clogged internally. And it's thick metal body makes it an extremely durable whistle. In order to refrain from adding an additional shape or ring to which a neck strap would connect, Wisl's strap utilizes its open design by wrapping around and inside the whistle. This allows Wisl to remain as clean as possible.
Wisl only exists as a protoype that I made for myself.