I got to thinking about the equinox in my own terms and within my own Life and the notion reminded me of equilibrium, which means, "the condition of a system in which all competing influences are balanced" but the idea of balance in my perspective does not necessarily mean stasis. Equilibrium is not really stasis when you consider the state in the context of the First Law of Thermodynamics. Equilibrium really implies motion:
In all cases in which work is produced by the agency of heat, a quantity of heat is consumed which is proportional to the work done; and conversely, by the expenditure of an equal quantity of work an equal quantity of heat is produced. -Rudolf Clausius
In the engineering perspective, "work" is what causes objects to move or displace. Using my trusty well-worn and meticulously tabbed thermodynamics book from college (I had three years of thermodynamics: basic, theoretical and applied), the term "work" has the following implication:
The work W done by, or on, a system is evaluated in terms of macroscopically observable forces and displacements..." -(Page 32) Fundamentals of Engineering Thermodynamics, Michael J. Moran and Howard N. Shapiro, Third Edition.
But before you guys start rolling your eyes again and begin thinking, "Oh!!! She is interpreting it literally again!!!" or think I am trying to force my scientific perspective to fit the metaphysical perspective. Think about it in the allegorical sense. Think about it in the "As above, so below..." perspective. Isn't Clausius' description of the First Law of Thermodynamics and "work" a perfect description of the "Great Work", that quintessential idea of perfection, the Philosopher's Stone?
I found a corollary to Clausius' description of the First Law of Thermodynamics in my own Work:
Thou art The Same all-present in Heaven and in Hell! Thou that vibratest between the Light and the Darkness! Rising, descending! Changing ever, yet ever The Same! - Liber Israfel Sub Figura LXIV, Aleister Crowley
So I postulate a sort of Riddle to you, in the flavor of the Riddle of the Sphinx:
What vibrates between Light and Darkness, turns lead into gold, but can never be created?