This video takes a while to get going, like many more scientific efforts.
Come in at 7 minutes if you want to get into some meat quickly. Salt is sprinkled onto the top of a speaker as the tones are changed.
Higher tones make more complex patterns, and lower ones less so. All very interesting until you realise that the exact same patterns appear on Sumerian clay tablets over 5000 years ago. Humanity knew far more then than it does today. I''l watch the rest later.