In order to more fully understand the plastic imagination, let us take up its principal manifestations.
1. First, the arts dealing with form, where its necessity is evident. The sculptor, painter, architect, must have visual and tactile-motor images; it is the material in which their creations are wrapped up. Even leaving out the striking acts requiring such a sure and tenacious external vision (portraits executed from memory, exact remembrance of faces at the end of twenty years, as in the case of Gavarni, etc.[81]), and limiting ourselves merely to the usual, the plastic arts demand an observant imagination. For the majority of men the concrete image of a face, a form, a color, usually remains vague and fleeting; "red, blue, black, white, tree, animal, head, mouth, arm, etc., are scarcely more than words, symbols expressing a rough synthesis. For the painter, on the other hand, images have a very high precision of details, and what he sees beneath the words or in real objects are analyzed facts, positive elements of perception and movement."[82]
The rôle of tactile-motor images is not insignificant. There has often been cited the instance of sculptors who, becoming blind, have nevertheless been able to fashion busts of close resemblance to the original. This is memory of touch and of the muscular sense, entirely equivalent to the visual memory of the portrait painters mentioned above. Practical knowledge of design and modeling--i.e., of contour and relief--though resulting from natural or acquired disposition, depends on cerebral conditions, the development of definite sensory-motor regions and their connections; and on psychological conditions--the acquisition and organization of appropriate images. "We learn to paint and carve," wrote a contemporary painter, "as we do sewing, embroidery, sawing, filing and turning." In short, like all manual labor requiring associated and combined acts.
2. Another form of plastic imagination uses words as means for evoking vivid and clear impressions of sight, touch, movement; it is the poetic or literary form. Of it we find in Victor Hugo a finished type. As all know, we need only open his works at hazard to find a stream of glittering images. But what is their nature? His recent biographers, guided by contemporary psychology, have well shown that they always paint scenes or movements. It is unnecessary to give proofs. Some facts have a broader range and throw light upon his psychology. Thus we are told that "he never dictates or rhymes from memory and composes only in writing, for he believes that writing has its own features, and he wants to _see the words_. Théophile Gautier, who knows and understands him so well, says: 'I also believe that in the sentence we need most of all an _ocular_ rhythm. A book is made to be read, not to be spoken aloud.'" It is added that "Victor Hugo never spoke his verses but wrote them out and would often illustrate them on the margin, as if he needed to fixate the image in order to find the appropriate word."[83]