At the head of the Fon arrangement is a pair understood as one. Mawu and Lisa, associated respectively with the moon, coolness and night, and with the sun, heat and day, are the creator, and the creator is dual. Sovereignty at the source is shared rather than singular, which is unusual, and it is one of the sharpest structural contrasts the atlas records with the single sovereign of the Greek or Norse arrangement.
Having created, they do not administer. The vodun are the powers that act in the world, arranged in families with their own domains, thunder, earth, iron, the sea, smallpox and healing among them, and each with its own priesthood, convents, drums, songs and prohibitions.
Fa, the divination system, is the mechanism by which a person finds out which vodun is concerned with them and what is required. It is not a separate practice bolted onto the religion; it is how the religion is navigated.
The roster grows locally and it grows through the royal past. The tohosu, associated with the royal lineage of Dahomey, occupy a distinct category, and the ancestors of a lineage are attended to as a matter of course.
This is a living religion and the parent tradition of Haitian Vodou. Its convents are entered by an initiation that is closed, and its initiates are held to secrecy. The atlas names that and does not work around it.