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." Monotheism and polytheism Gardner stated that beyond Wicca's two deities was the "Supreme Deity" or "Prime Mover", an entity that was too complex for humans to understand. This belief has been endorsed by other prominent practitioners, who have referred to it as "the Cosmic Logos", "Supreme Cosmic Power", or "Godhead". Gardner envisioned this Supreme Deity as a deist entity who had created the "Under-Gods", among them the God and Goddess, but who was not otherwise involved in the world; alternately, other Wiccans have interpreted such an entity as a pantheistic being, of whom the God and Goddess are facets. Although Gardner criticised monotheism, citing the Problem of Evil, explicitly monotheistic forms of Wicca developed in the 1960s, when the U.S.-based Church of Wicca developed a theology rooted in the worship of what they described as "one deity, without gender". In the 1970s, Dianic Wiccan groups developed which were devoted to a singular, monotheistic Goddess; this approach was often criticised by members of British Traditional Wiccan groups, who lambasted such Goddess monotheism as an inverted imitation of Christian theology. As in other forms of Wicca, some Goddess monotheists have expressed the view that the Goddess is not an entity with a literal existence, but rather a Jungian archetype. As well as pantheism and duotheism, many Wiccans accept the concept of polytheism, thereby believing that there are many different deities. Some accept the view espoused by the occultist Dion Fortune that "all gods are one god,