 In Book I Agrippa explores the elemental world, reviewing the manifest and occult virtues of stones, plants, animals, and human individuals. Occult virtues, on which natural magic mainly focuses, are explained by the relationship of causal correspondence, connecting the eternal exemplars, the ideas, to the sublunary forms through the stars. In his Neoplatonic animated cosmos, all things are harmoniously related to each other. Magical activity consists chiefly in attracting the “spirit of the world” (spiritus mundi). It is diffused everywhere and distributes life to everything, acting as the mediator between heavenly souls and earthly bodies, and allowing a sympathetic exchange between the different levels of the ontological hierarchy.