Ballroom Dancers evolve in the sport of dancing just as any other athlete evolves in their specific sport. The particular evolution we are interested in here, is the aspect of the partnership. There aren't many other sports that require a partnership similar to Ballroom Dancing. Pair's Figure Skating is the only other sport that comes to mind. The Ballroom Dance partnership evolves from the beginning dancer's crude dual movements to the most advanced dancer's state of "Singularity". The goal is to become a single entity when we dance (a two-headed four-legged animal).
When a couple first starts to learn to become Ballroom dancers, they typically learn foot patterns that they perform in front of each other. There is usually no semblance of a partnership. The music plays and each dancer is focused on performing the foot pattern they were just taught.
The next stage is the awareness that the two dancers need to move in unison. The dance frame is introduced to try to connect the two dancers together. The goal now is not to only perform the foot patterns, but also to try to do it in unison with their partner without anyone getting hurt.
Once the dancer's awareness of each other has started to develop, the concept of lead and follow is introduced. The lady dances what she can feel (one step at a time) and the man dances elements/patterns because he has to plan ahead. It is the man's job to dance the ladies every single footstep and place her is such a position that she can do only one thing (she has no decisions to make).
The concept of "Yin-Yang" works very well to illustrate the partnership because Yin represents the feminine half and Yang represents the masculine half. Yin and Yang are complementary to each other, not opposites. The "Yin-Yang" connection allows the partnership communication to be further developed. The Yin-Yang stage is a much more refined partnership concept, but it is still not "Singularity".
A further refinement of "Yin-Yang" changes the "connection" between the two to an "attraction". Think of an "attraction" as a Star Trek "tractor beam". The word "connection" implies that the two partners are pushing toward each other. This "connection" pushes the partnership apart whereas an "attraction" holds it together. I tell my students that the partnership should be more like a moving hug.
As the Yin-Yang "attraction" evolves, the Yin and Yang seem to dissolve into each other and at the highest levels, "Singularity" comes into being. Singularity is not a partnership, a connection or an attraction. It is just simply a "Singularity".
The terms "Partnership", "Connection" and "Attraction" implies two entities by definition, a duality. "Singularity" implies a single entity. There is just one being on the dance floor, a "Singularity".
The primary objective of Ballroom Dancing is to evolve two dancers (a duality) into a single entity, the two-headed four-legged animal. There is no partnership, no connection, no attraction, just the existence of a single entity. This entity, "Singularity", has a single consciousness and a single physicality. It is logically a single being capable of moving and acting as a "Singularity".