quite right Robin . most folks have heard of Chladni plates and know the effect . Rather like most folks know there are millions of tons of water hanging in the sky defying gravity but have no idea how or why.
Chlandi figures are simply an effect . your video just like all other video's on the subject make no attempt to derive the all important mathematics of that effect .
The effect your watching is created by an impulse . in the case of the violin bow very rapid binding and letting go of a string or edge.
This effect particularly at RF is denied and totally ignored in electrical theory,not least because of its association with so called free energy devices. It also ignores the potential medical benefits. (except when it suits)
you have seen no doubt how the Rife machines tend to use fast switching square waves to introduce this peculiar 'impulse resonance' effect. you can't hear the carrier wave but you can see the plasma . with the computers sound system turned on you can hear most of the modulation frequencies.
There is in effect a whole field of very different electrical theory 'suppressed'. If you research a little more Chladni figures you'll find they were noted and documented by English Polymath Robert Hooke
Peer of Newton . As was customary at the time Newton was called upon to upgrade his local Parish church . The upgrade was to consist of a matched set of three bells .
To advise and guide this 'matched tuned set ' Newton called on the assist of musician Hooke . It is clear then that Hooke had solved the transition of impulse to practical manufacture.
Nothing sinister about that I guess until you find Hooke also wrote extensively on Gravity and its effects long before Newton and that Newton dare not publish on the subject until Hooke's death.
After Hooke's death newton had all paintings of Hooke and all his work recorded in the royal society destroyed . It goes without saying gravity still remains something of a mystery.