A thought that has found a plastic expression must continue to expand in keeping with its own plastic idiom. A plastic idea must be expressed with plastic means just as a musical idea is expressed with musical means, or a literary idea with verbal means. Neither music nor literature are wholly translatable into other art forms; and so a plastic art cannot be created through a superimposed literary meaning. The artist who attempts to do so produces nothing more than a show-booth. He contents himself with visual story-telling. He subjects himself to a mechanistic kind of thinking which disintegrates into fragments.