Taking an ordinary sine wave pattern as a SYMBOL over time of Expansion then Contraction it can be visualized how one enharmonic chord decreates while a harmonic chord creates over time. (The notes shown are arbitrary and symbolic and do not represent any particular functional chord.)
Notice the triplet of notes (three notes sounded simultaneously) forming a chord. These REPRESENT the three currents (three notes) making up a Whole Chord or Whole Flow. Keely's use of musical triplets then is an accurate depiction of the structure of Whole Flows composed of thirds, sixths and ninths, as functional portions, of that Flow.