The emptiness of physical flute and sweetness of its non-physical divine sound!
Flute is a divine instrument. It has six holes of maya at various energy levels. It symbolises the symphony of life from M maya to P parmatma.
Once parmatma blows it with pran vayu opening all the holes of maya, a life comes in to existence with maya all around. Then once it grows responsibly, He keeps on closing holes one by one for it to complete its journey.