Cloud
Clouds are a symbol of confusion and unconsciousness, particularly dark clouds. They obscure the sun (consciousness), acting as a kind of fog in the sky; one cannot orient oneself in fog or clouds.
In Christian tradition, it is the devil who creates clouds, while in many other belief systems, a giant or a monster is responsible. On the other hand, dignified white clouds in a blue sky are a beautiful and majestic sight that has given mystics associations with the greatness of God. In ancient times, it was believed that the gods resided on majestic clouds; in the Bible, God appears as a cloud or speaks from a cloud on several occasions.
The heavenly clouds are, of course, also associated with rain and therefore fertility (and thunder). In the ancient text De Chemia (quoted in von Franz, 2022, p. 249), for example, it is written: “Observe and understand how the clouds rise from the sea, carrying the blessed water with them, and they saturate the earth, and there seeds and flowers sprout.” Another example from von Franz is found in Biblia Mariana, where it is said that “the Virgin Mary is the cloud that cools, rains, and gives,” as well as “the cloud that overshadows and guides.”
In alchemy, clouds represent spirit or sublimation, often more specifically vaporized mercury (Mercurius). Dark clouds were an expression of nigredo—depression, defeat, and so on.
Clouds are an image of the utterly unconscious—they lack distinct form and transform before our eyes, defying our ability to "grasp" them. They are ethereal, elusive, concealing, and casting shadows. Only when the content becomes sufficiently conscious does it appear as something recognizable.