John Cage playing amplified cacti and plant materials with a feather

John Cage performing on Nam June Paik's TV special called 'Good Morning Mr. Orwell' from 1984. In the beginning, we see that Cage is joined by Takehisa Kosugi and one other unidentified person. perhaps they were performing a composition or improvisation that they would have done during a Merce Cunningham dance. there is also a cut away to a Joseph Bueys piano performance art piece.
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(Thanx Michael!)