So what are you looking at? Just salt, a speaker and a cookie sheet, but the outcome is fascinating. The phenomenon is called a Chladni Pattern, and seeing how sound waves affect matter is one great example of how interesting all the waves surrounding us are.
Below is another video featuring the sweet salt science. It’s narrated by David Icke, so be warned, you’re in for some kooky metaphysical yammering and pseudo-science postulation — but it’s super trippy nonetheless.