The creatures are "variations on fantasy archetypes" and include demons, giant spiders, giant frogs, and beasts inspired by Dungeons & Dragons.
Through studying folklore, world mythologies, and the dreams of his patients, Jung identified these components of the psyche as expressions of instinctual patterns (or archetypes).
Robert L. Moore and Douglas Gillette collaborated on a series of five books on male psychology and mythopoetic aspects of human development, including King, Warrior, Magician, Lover, and a book exploring each of these four archetypes.
Upper Miterdale formed one of the archetypes upon which Arthur Ransome based the valley of Swallowdale in the eponymous volume of Swallows and Amazons series of stories.
The latter two were primarily sexually explicit performers, described as 'Archetypes of the Dark Feminine psyche' personifying Kali, the Hindu Goddess of death, and Erzulie, the Voudoo Goddess of Love.
The Writer's Journey: Mythic Structure For Writers is a popular screenwriting textbook by writer Christopher Vogler, focusing on the theory that most stories can be boiled down to a series of narrative structures and character archetypes, described through mythological allegory.
Admiring Sidney Nolan’s Ned Kelly paintings and he developed numerous series based on such archetypes; typically producing a large number of works for each series.