Sound Made Visible

If sound waves could be drawn, what would they look like? I saw a video today called "Cool Salt" and got an idea of what that looks like. They put a speaker under a flat surface with salt, and as the pitch coming out of the speaker rises, the salt moves into different patterns.

If this is for real, what effect does pitch have on our bodies? What reactions are our cells having as pitch rises and falls?

Fun food for thought.