It [number] preconsciously orders both psychic thought processes and the manifestations of material reality. - Marie-Louise von Franz

When a person has inwardly struggled with his anima or with her animus for a sufficiently long time and has reached the point where he or she is no longer identified with it in an unconscious fashion, the unconscious once again takes on a new symbolic form in relating with the ego. It then appears in the form of the psychic core, that is, the Self. In the dreams of a woman, the Self, when it personifies itself, manifests as a superior female figure, for example, as a priestess, a sorceress, an earth mother, or a nature or love goddess. In the dreams of a man, it takes the form of some-one who confers initiations (an Indian guru), a wise old man, a nature spirit, a hero, and so forth. An Austrian fairy tale recounts the following:

Always at bottom there is a divine revelation, a divine act, and man has only had the bright idea of copying it. That is how the crafts all came into existence and is why they all have a mystical background. In primitive civilizations one is still aware of it, and this accounts for the fact that generally they are better craftsmen than we who have lost this awareness. If we think that every craft, whether carpenter's or smith's or weaver's, was a divine revelation, then we understand better the mystical process which certain creation myths characterize as God creating the world like a craftsman. By creating the world through such a craft he manifests a secret of his own mysterious skill.

Number is therefore the most primitive instrument of bringing an unconscious awareness of order into consciousness; from it you can best tap the unconscious constellation. This probably why it is used in most mantic methods.