Divination by Salt and Sound

So I watched this video, as I was getting ready to go to sleep, and maybe I'm a little out of it, but the motions kind of spoke to me.

And really, is it just me, or could this form the basis for a divinatory system? Now I want one to play with. With different-shaped plates. Circles and ellipses and ovoids and things. Yes.

What would we call it?

And how do I get those wonderful toys?