The Complement relationship resembles a symbiotic partnership in an ecosystem. One person's concavity fits perfectly into the other's convexity; weaknesses are filled by strengths. The chemical balance in this relationship is remarkably precise -- like an enzyme and its substrate, their shapes inherently require each other. Even the balance of neurotransmitters may be optimized when the two are together. The magic of the Complement type lies in the liberation of never needing to feel ashamed of what you cannot do. There is no need to force yourself to imitate what the other person does naturally. You conserve energy and focus on your own area of expertise. From the standpoint of efficient allocation of cognitive resources, this is supremely rational. The brain is an organ that constantly seeks to conserve energy, and the Complement relationship satisfies that instinct.