L. Gordon Plummer, By the holy Tetraktys! Symbol and reality in man and universe, Point Loma Publications Study Series No. 9 Buena Park California 1982, softcover 100 pp. Zelden of nooit aangeboden. Gevraagd. Zeer scherpe prijs! (44)

He would draw a figure that became known as Tetractys, a sacred symbol for many centuries to follow. It is an equilateral triangle, made out of ten dots arranged in four rows. Each row (and each dot) carry different symbolism. The four rows symbolize the four stages of creation.