Cosmic Alchemy - Jung saw in alchemy a metaphor for the process of individuation, and the morphing and mutating imagery of that process which emerges from the stream of consciousness.
Most of us, unfamiliar with the subtle nuances of alchemical practice, view it as the historical predecessor of our modern sciences, like medicine, chemistry, metallurgy, etc. But, according to Jung's research, it seems to be much, much more.
Although there are many types of alchemy, the main split is between intro- and extroverted forms. The deciding factor is the direction of the practitioner's creativity.