The non-mathematical principle above suggests that the marriage of two elements creates a third entity: the relationship between the two. Have you ever seen a couple act completely different when together than when they are alone? As if there is an invisible entity between them, determining how they relate not only to one another but also to the world around them. Essentially, the togetherness of the two becomes a third person (and I'm not speaking of babies).

This is the principle of perfume. An entity that is greater than the sum of all its parts - mathematically speaking, of course: We know that perfume bounds to the laws of alchemy rather than mathematics or chemistry per-se.