Cecil’s comments on the sound of the one hand are not as helpful as they should be.
The fact is, there is a sound. You last heard it when you were an infant, before you learned to clap.
Back then, the universe was a very confused place. Sights, sounds, and sensations would come and go without cause. You would feel hunger and gurgle and there would be warmth and satiation, light and dark, in no particular order.
But that first time you clapped, there was an event. There was a before and and after. There was a touch and a sound. Self and other. Cause and effect. This is the moment that self-awareness is born.
You see tiny children clap again and again, establishing their mastery over the universe - until they discover the universe is seldom so agreeable as at that first time. But the sound of the clap masks something important. Something you’ve forgotten.
Happily, you can still hear the sound of the one hand. It is not just a sound - because the experience before you first clapped was not divided into sound and sight and touch. Still most people start by listening for the sound.
Look at your hand. Listen to it. Feel, with it. Feel the listening and looking. Listen to the feeling. It will be as if a tiny thin crack opens in the world you understand - because the world of understanding is all based on that first clap. Listen harder. And slowly the world of understanding itself becomes a malleable thing, held by the one hand.
Once you learn to hear the sound of the one hand, you become aware of so much that was previously shuttered to you that you struggle to find words to convey it. Trying to share, you will see people’s faces go blank. They will not understand what you are trying to tell them unless you can get them to also hear the sound of the one hand.
All you can really do is tell them how, and after they do that you share your new understanding with them without even trying.
Try it! What do you have to lose?
ETA: Link to column - What is the sound of one hand clapping? - The Straight Dope