Juthro, my mind went immediately to piezoelectric generation via sound wave distortion of the rock, but the narrator made the same mistake most make in the assumption of the levitation being accomplished via "electromagnetic" activity. It would have been more likely, electrostatic or dielectric activity, which I have long been maintaining here is what got arbitrarily tagged with the invented name, "gravity."
Swayambhu, you seem to be in the materialist camp. Replace the word, nothingness, with no-thing-ness. Could all this come from some quality that is finer even than your fart?