[Soon: tetraktys, music and quarks]
The harmonic evolution digraph is
Tree = T4
Loops = L1 + 9 L7
Comment: It has been noted often that tetraktys was the source and inspiration for the cabalistic sefirot, or "tree of life." Although the sefirot tree has a different structure, their harmonic evolution digraphs are almost identical! The loop part is the same; the trees are rearranged. Note the presence of the mystic number 7 --- that is the length of the cycle in each of this graphs.