Contemporary psychology has studied the purely reproductive imagination with great eagerness and success. The works on the different image-groups—visual, auditory, tactile, motor—are known to everyone, and form a collection of inquiries solidly based on subjective and objective observation, on pathological facts and laboratory experiments. The study of the creative or constructive imagination, on the other hand, has been almost entirely neglected. The constructive imagination is a faculty that in the course of ages has undergone a reduction — or at least, some profound changes. So, for reasons indicated later on, the mythic activity has been taken in this work as the central point of our topic, as the primitive and typical form out of which the greater number of the others have arisen. The creative power is there shown entirely unconfined, freed from all hindrance, careless of the possible and the impossible; in a pure state, unadulterated by the opposing influence of imitation, of ratiocination, of the knowledge of natural laws and their uniformity.