Inspiration resembles a cipher dispatch which the unconscious activity transmits to the conscious process, which translates it. Must we admit that in the deep levels of the unconscious there are formed only fragmentary combinations and that they reach complete systematization only in clear consciousness, or, rather, is the creative labor identical in both cases? It is difficult to decide. It seems to be accepted that genius, or at least richness, in invention depends on the subliminal imagination,[21] not on the other, which is superficial in nature and soon exhausted. The one is spontaneous, true; the other, artificial, feigned. "Inspiration" signifies unconscious imagination, and is only a special case of it. Conscious imagination is a kind of perfected state. To sum up, inspiration is the result of an underhand process existing in men, in some to a very great degree. The nature of this work being unknown, we can conclude nothing as to the ultimate nature of inspiration. On the other hand, we may in a positive manner fix the value of the phenomenon in invention, all the more as we are inclined to over-value it. We should, indeed, note that inspiration is not a cause but an effect--more exactly, a moment, a crisis, a critical stage; it is an _index_. It marks either the end of an unconscious elaboration which may have been very short or very long, or else the beginning of a conscious elaboration which will be very short or very long (this is seen especially in cases of creation suggested by chance). On the one hand, it never has an absolute beginning; on the other hand, it never delivers a finished work; the history of inventions sufficiently proves this. Furthermore, one may pass beyond it; many creations long in preparation seem without a crisis, strictly so called; such as Newton's law of attraction, Leonardo da Vinci's "Last Supper," and the "Mona Lisa." Finally, many have felt themselves really inspired without producing anything of value.[22] II What has been said up to this point does not exhaust the study of the unconscious factor as a source of new combinations. Its role can be studied under a simpler and more limited form. For this purpose we need to return for the last time to association of ideas. The final reason for association (outside of contiguity, in part at least) must be sought in the temperament, character, individuality of the subject, often even in the _moment_; that is, in a passing influence, hardly perceptible because it is unconscious or subconscious. These momentary dispositions in latent form can excite novel relations in two ways--through mediate association and through a special mode of grouping which has recently received the name "constellation."