A core aspect of Tantra is the equivalence or union of the macrocosm and the microcosm.
Macrocosm means the universe at large, specifically divine powers or deities that rule over the universe.
The microcosm means the individual self—the human body.
In Tantric ritual one strives to bring the divine presence into one’s own body. In this way, one unites the macrocosm (divine universe) and microcosm (oneself).