Each note in this instrument comes from a glass jar partially filled with water. A flexible tube enters the water, and when the player blows on the other end of the tube, the water gurgles and bubbles. Pitch is determined by the volume of air within the jar above the water line and the size of the opening above. There are several such jars and tubes, and at the opposite ends of the tubes – the blowing ends – they’re held together in a row by a wooden cross-piece. The playing technique is like that of a harmonica, as you blow through the different tube-ends to get different notes.