In order to complete and establish the silhouette effect, the color in the best tapestries is laid on in broad flat areas, each containing only a limited number of tones. A gradual transition of tone through many shades is undesirable, because such modulations convey an impression of relief modeling, which is inappropriate and superfluous in an art of silhouette. Then, again, these gradations at a little distance tend to fuse, and thus somewhat blur the force and purity of the color; and, finally, a considerable number of color transitions are ill-adapted to the character of a textile, as they tend to make it appear too much like painting. Nor are fluctuating tones and minute value-gradations necessary for a soft and varied effect. The very quality of tapestry material accomplishes that--first, because the ribbed surface breaks up the flatness of any color area and gives it shimmering variations of light and shade, and, second, because the wide folds natural to the material throw the flat tones now into dark and now into light, thus by direct light and shade differentiating values that in the dyes themselves are identical. Color in tapestry can thus be used in purer, more saturated masses than in any form of painting, not excepting even the greatest murals. Flat silhouetted figures cannot of course be set in a three-dimensional world. They would not fit. So the landscape, too, must be flattened out into artificially simplified stages. This is also necessary both for the architectural and the decorative effect of tapestry, for otherwise the remote vistas tend to give the effect of holes in the wall, and the distance, dimmed by atmosphere, is too pallid and empty to be interesting as textile design. Yet the fact of perspective cannot be altogether denied. Often the designer can avoid or limit the problem by cutting off the farther views with a close screen of trees and buildings, and this has also the advantage of giving a strong backdrop against which the figures stand out firm and clear. But there are occasions in which a wider field is essential for the purposes of illustration. The problem is how to show a stretch of country and still keep it flat and full of detail. In the most skillful periods of tapestry design the difficulty was met by reducing the perspective to three or four sharply stepped levels of distance, laid one above the other in informal horizontal strips. Aerial perspective was disregarded, each strip being filled with details, all sharply drawn but diminishing in size. The scene was thus kept relatively flat, was adapted to flat figures, and was also filled with interesting details.