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In the Grimaud TdM (Paul Marteau's version of the Conver), one of the vessels is blue, the other red. In the usual color symbolism, blue is water, and red is fire. Apparently, Marteau is depicting an alchemical interpretation: the union of opposites (water and fire), as a process for creating the Philosopher's Stone, as in the Thoth Art (Temperance) card.
It is natural to view this in the context of spiritual alchemy, in which the elements of fire and water represent the spirit and soul of a person. The blending/synthesis of these aspects is the process of attaining completeness, the healing of conflicts within the individual. This is similar to what Carl Jung called individuation, which involved the bringing of unconscious contents of the mind into consciousness.
Of course, this smacks of woo-woo, which is totally unfashionable in the conventional interpretation of the TdM images. However, I think the Temperance card throws woo-woo right into our faces by depicting an impossibility: the flow of a fluid from one container to another having a non-vertical trajectory.