Ever heard the sound of blinking of eyes?
Heard the sound of blood beating through the vein at back of head?
Heard the hissing sound of leaf falling down?
I heard.... did you? I do hear sometimes....
Heard the sound of a dry leaf falling down and hitting each trunk?
Heard the sound of that dry leaf hitting the ground through different corners, flown by air?
Heard the sound of air zipping past a smallest opening in windows?
Heard the screeching sound of iron wheels of a train running on rails?
I heard these too... did you?