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Kircher’s system shows certain affinities with our series of quaternios. Thus the Second Monad is a duality consisting of opposites, corresponding to the angelic world that was split by Lucifer’s fall. Another significant analogy is that Kircher conceives his schema as a cycle set in motion by God as the prime cause, and unfolding out of itself, but brought back to God again through the activity of human understanding, so that the end returns once more to the beginning. This, too, is an analogy of our formula. The alchemists were fond of picturing their opus as a circulatory process, as a circular distillation or as the uroboros, the snake biting its own tail, and they made innumerable pictures of this process. Just as the central idea of the lapis Philosophorum plainly signifies the self, so the opus with its countless symbols illustrates the process of individuation, the step-by-step development of the self from an unconscious state to a conscious one. That is why the lapis, as prima materia, stands at the beginning of the process as well as at the end.113 According to Michael Maier, the gold, another synonym for the self, comes from the opus circulatorium of the sun. This circle is “the line that runs back upon itself (like the serpent that with its head bites its own tail), wherein that eternal painter and potter, God, may be discerned.”114 In this circle, Nature “has related the four qualities to one another and drawn, as it were, an equilateral square, since contraries are bound together by contraries, and enemies by enemies, with the same everlasting bonds.” Maier compares this squaring of the circle to the “homo quadratus,” the four-square man, who “remains himself” come weal come woe.115 He calls it the “golden house, the twicebisected circle, the four-cornered phalanx, the rampart, the city wall, the four-sided line of battle.”116 This circle is a magic circle consisting of the union of opposites, “immune to all injury.
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C.G. Jung (Aion: Researches into the Phenomenology of the Self (Collected Works, Vol 9ii))