Incredible musical instrument - the Vibrating Waterphone

Waterphone instrument was invented by Richard Waters. The Instrument on the video bases on his idea but it is designed and built by me. It has unique vibrato effect which is achieved by shaking the instrument. Special shape of instrument allows this effect to occur. Propably this is the only waterphone which has this feature. At least I've never seen and heard of this, so I report waterphone vibrato feature as a first. This waterphone is made of stainless steel and brass. The water inside plays important role. The tuning bases on two different pentatonic scales with microtonal temperaments.