Many persons hearing for the first time the statement of psychologists that the imaginative faculties can re-present and re-produce or re-combine only the images which have previously been impressed upon the mind, are apt to object that they can, and frequently do, image things which they have not previously experienced. But can they and do they? Is it not true that what they believe to be original creations of the imagination are merely _new combinations_ of original impressions? For instance, no one ever saw a unicorn, and yet some one originally imagined its form. But a little thought will show that the image of the unicorn is merely that of an animal having the head, neck, and body of a horse, with the beard of a goat, the legs of a buck, the tail of a lion, and a long, tapering horn, spirally twisted, in the middle of the forehead. Each of the several parts of the unicorn exists in some living animal, although the unicorn, composed of all of these parts, is non-existent outside of fable. In the same way the centaur is composed of the body, legs, and tail of the horse and the trunk, head, and arms of a man. The satyr has the head, body, and arms of a man, with the horns, legs, and hoofs of a goat. The mermaid has the head, arms, and trunk of a woman, joined at the waist to the body and tail of a fish. The mythological "devil" has the head, body, and arms of a man, with the horns, legs, and cloven foot of the lower animal, and a peculiar tail composed of that of some animal but tipped with a spearhead. Each of these characteristics is composed of familiar images of experience. The imagination may occupy itself for a lifetime turning out impossible animals of this kind, but every part thereof will be found to correspond to something existent in nature, and experienced by the mind of the person creating the strange beast.