Any distinction is to point out a singular phenomenon composed as the apex of a series of phenomenon. To look at a deer is to see a series of parts which compose the deer. The deer is a relationship of multiple parts with this relationship being one of change.
This change is the inversion of one part of the deer into another. For example in looking at a leg the leg changes into hair or a torso. In looking at the hair or torso they reconverge into the leg.
The distinction is the point of change where any singularly observed phenomenon is many phenomena converging into one, or one phenomenon diverging into many.