Jung describes this as the inherited potentialities of human imagination.
It is the all controlling deposit of ancestral experiences from untold millions of years, the echo of prehistoric world events to which each century adds an infinitesimal small amount of variation and differentiation. These primordial images are the most ancient, universal, and deep thoughts of mankind.’
Jung tried to explain his observation of a strata of being in which individual minds have their collective origin in a genetic way. This seems unlikely, and Rupert Sheldrake sees it as a mental phenomena. Dr Maurice Bucke called it cosmic consciousness. J.B. Priestley saw it as ‘the flame of life’ which synthesised the experience of all living things and held within itself the essentials of all lives.
If we think of it as a vast collective memory of all that has existed, then we can say the life of Edgar Cayce exhibited a working relationship with it.
Such a collective level of mind would explain many things, such as telepathy, out of body experiences, life after death, which have always been puzzling because they are difficult to explain using presently known principles. ... A Guide to Dreams and Sleep Experiences