For he is The Sinwavezigurat!

for HE is the KumkwaatHaagendazs!

For he is the SkeetsharkCadillac!

Actually I'm thinking of something else, I've known about (much cruder) versions of this for a long time but what I heard about a couple years ago and then never again was an early prototype of a system for adding 3d tactile sensations to touchscreens using a similar approach.

Unlike many of these clips, the creators were kind enough to provide a short abstract of previous work. So you can see the idea is an old one. There is a demo of the '75 work at one of the science museums in the New York area; basically a horizontal tube with a loudspeaker to drive the whole into a standing wave resonance. small particles inside the tube rise up in the nodes of the standing wave and levitate as seen here.

That's pretty brave. At those sound pressures I might expect to see cavitation in a fluid, like your ball sack. In fact, Putterman et al claimed that in a spherical resonator ( like each of your actual nuts ) you can get shock waves in the center that trigger tiny fusion events. You'd have a little fusion reactor in each ball. It might hurt a bit; but SCIENCE!

I'm not seeing a downside. In fact, your explanation only entices me more. Would it be possible to recharge my wireless devices that way?

Also, what if these 'spherical' resonators are more on the oblate side? Or extremely on the oblate side? And what if one of them is a bit smaller than the other?

Also his balls are fusion reactors.

5 stars all around.

5 for all of it and you