 Lee and Shen believed that the Chinese understood the "resonance of an air column" (see open tube and closed tube) and were able to create an instrument that contained their "complete interval preference of Chinese music".Blowing across the open end of an end-blown bone flute to produce a musical sound, is accomplished in the same way, and produces a similar effect, as blowing across the open top of a bottle.The eight-holed flute can play "all harmonic intervals and two registers."