We find, however, that alchemy did not merely change into chemistry by gradually discovering how to break away from its mythological premises, but that it also became, or had always been, a kind of mystic philosophy. The idea of the coniunctio served on the one hand to shed light on the mystery of chemical combination, while on the other it became the symbol of the unio mystica, since, as a mythologem, it expresses the archetype of the union of opposites. Now the archetypes do not represent anything external, non-psychic, although they do of course owe the concreteness of their imagery to impressions received from without. Rather, independently of, and sometimes in direct contrast to, the outward forms they may take, they represent the life and essence of a non-individual psyche. Although this psyche is innate in every individual it can neither be modified nor possessed by him personally. It is the same in the individual as it is in the crowd and ultimately in everybody. It is the precondition of each individual psyche, just as the sea is the carrier of the individual wave.