A vegetation deity is a nature deity whose disappearance and reappearance, or life, death and rebirth, embodies the growth cycle of plants. In nature worship, the deity can be a god or goddess with the ability to regenerate itself. A vegetation deity is often a fertility deity. The deity typically undergoes dismemberment (see sparagmos), scattering, and reintegration, as narrated in a myth or reenacted by a religious ritual. The cyclical pattern is given theological significance on themes such as immortality, resurrection, and reincarnation. Vegetation myths have structural resemblances to certain creation myths in which parts of a being's body generate aspects of the cosmos, such as the Norse myth of Ymir.