As a quick placeholder:
Reciprocal Opening is (something like) the process of "spiraling up" that occurs due to the interaction between the apparently polar forces of energy...
This may be something like the fundamental creative movement of the universe that causes the basic patterns of Life to manifest, as obviously revealed in places such as DNA, nautalus shells, sunflowers, etc.
The spiraling of apparently polar energy around a centerline or Phi Line (referring to the Golden Ratio of math, architecture, and art) or Source Line may be what causes the emergence of Life and structure to manifest from the Creative Field of Potential.
It may be that all these Phi Lines / Source Lines are ultimately connected back to One Thing that ultimately orders the universe.
It may also be that we are experientially situated right in the center of something trying to emerge through us. If this is the case, our job is to stay perfectly centered on the Phi Line, to the very best holding One intention as the New Life that is trying to emerge reciprocally unfolds / spirals up around the Center Line we are All connecting to and Co-Creating.