What does sound look like>

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

I found it interesting that sound can be visualize, and that the technique to do this is a relatively simple technique. Before I viewed the video, I assumed that visualizing sound meant looking at sound waves. However, the video depicted a technique that allowed the audience to see where and how fast the sound was traveling. Seeing visualized sound helped me understand that sound travels in a circular path that expands and weakens as it travels. Although I understood that concept previously, it made me rethink how audio should be captured for a video.