What Does Sound Look Like?

What do you find interesting about this video? How does seeing sound visualized help you understand what sound is?

When they displayed the science behind sound I got to see a good example of how sound waves are shown and work. It was all a scientific and manual method, on how to see sound. When the guy clapped sound waves shot out from the clap. It's a audio and visual effect, which I find very fascinating. Seeing this helped me understand how sound works how you can see it. 

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