Sound is a mystery just like all the other elements of life: a bunch of atoms moving together, air pressure that goes into the ear and makes the eardrum vibrate, which creates electrical signals that get interpreted as Beethoven's 9th symphony. We use it to communicate and transport a multitude of meaning with it. Sounds can make us feel pleasant, and make us sick. But we usually don't pay much attention to sound, you could say it's invisible to us. But you can make sound visible, and the results are quite amazing!