What if we suddenly discovered that there were aliens in the micro-world? Like intelligent bacteria that had developed civilizations and culture beyond our level, just really small.
The decisive thing is not the reality of the object, but the reality of the subjective factor, i.e. the primordial images, which in their totality represent a psychic mirror-world. It is a mirror, however, with the peculiar capacity of representing the present contents of consciousness not in their known and customary form but in a certain sense sub specie aeternitatis, somewhat as a million-year old consciousness might see them.
(Jung on Si)