Sometime in the early 1970s, an unknown artist filmed minimal musician Terry Riley in his home playing analog synthesizer and occasionally the duck pond outside his window. This footage has been tinted to correspond with the musical notes played in the film. Isaac Newton developed this correspondence in the late 17th century linking his ROYGBIV color scale with the notes of an octave, the then-known seven planets of our solar system; the color red corresponding with the note C, orange with D, yellow with E, green with F, blue with G, indigo with A, violet with B and combinations in between.