Other Wiccans have adopted the original Gardnerian God/Goddess duotheistic structure but have adopted deity forms other than that of the Horned God and Mother Goddess. For instance, the God has been interpreted as the Oak King and the Holly King, as well as the Sun God, Son/Lover God, and Vegetation God. He has also been seen in the roles of the Leader of the Wild Hunt and the Lord of Death. The Goddess is often portrayed as a Triple Goddess, thereby being a triadic deity comprising a Maiden goddess, a Mother goddess, and a Crone goddess, each of whom has different associations, namely virginity, fertility, and wisdom. Other Wiccan conceptualisations have portrayed her as a Moon Goddess and as a Menstruating Goddess. According to the anthropologist Susan Greenwood, in Wicca the Goddess is "a symbol of self-transformation - she is seen to be constantly changing and a force for change for those who open themselves up to her."