Ray of Creation

 Triads inside the Triads
 Pitagorian Tetrakys
 Three descendent Triads, full of substance
 and one ascendetn Triad, empty
 (one must be empty to ascend).

Sumerian cosmology is grounded in the
 metaphorical copulation of the male A
 and female V numerical arrays,
 from which  the Greek "holy tetraktys"
 is abstracted.

Musical Theory and Ancient Cosmology
Ernest G. McClain

Stairs and Elevator