This above is the 'only' known Video of the reclusive though astoundingly brilliant artist known to some as "Uncle Happy" or "Uncle Sidney".
Not since "what's his name" that wrote "The Catcher in the Rye" has an artist performer been so difficult to track down.
Yet here he is in this very brief recording actually at the microphone...though not speaking. Of course there is some controversy as to if this actually 'is' "Uncle".
Nevertheless most historians of his mediums are fairly convinced it's him.