The flute without holes
is the most difficult to blow.
... Not only difficult, it is impossible. So what the poet is saying is, the flute has all the possibility of bringing songs to the world; you just have to open all your doors and windows, all your holes. Otherwise, every bamboo will be a flute; they have the potentiality.
Just a little difference — opening a few doors, a few windows, just a few holes in a hollow bamboo — and it becomes a great instrument of music. Existence can flow through it and can become a great musical wave.
Existence has its own sound and its own music. We just have to be silent enough to hear the soundless sound.
Osho: Turning In