Ross Robertson wrote:
If this is of any interest to you, I urge you to identify your own set of constants and variables which define your practice.
Not really constants or variables but...
A metaphor I find helpful in my training: I have 4 coins. Each coin has two sides. The sides of the coins correspond to the parings of the forces. Each force extends into the coin and at some point becomes its opposite. Aikido happens where each force is neither itself nor the other; where motion and stillness, solidification and fluidity, extension and contraction, unification and division are indistinguishable.
In my Aikido practice I seek to experience and strengthen the feeling associated with being at that place where Aikido happens in order that I may internalize it and recall it at will.