For Carl Jung, the art of alchemy was a system of symbols. The transformation of the subject occurred through them: the subject's personality would go from a basic state (lead) to a different one (gold). So, he considered that the symbols from alchemy were archetypal images of the unconscious. If you have this dream, therefore, it is possible you will go through an internal change. Alchemy was, in the Middle Ages, what psychology is for us today. Its symbolism still identifies with internal success throughout the unconscious.