Broken lines give us a feeling of life and movement. But they should not be used for the permanent decorative lines of a room—the lines of the walls, openings, hangings, draperies, carpets, or large, immovable pieces of furniture which have a fixed place. In pillows which break the long back line of a couch, in cornice moldings, lambrequin bottoms, chair backs, screens, etc., they lend life. But as a rule they should be sparingly used.
VERTICAL LINES
Vertical lines express aspiration and disquietude; diagonal lines, action. In wall paper designs and rug patterns the diagonal line is not always excellent. Diagonal lines are sometimes effective in rugs; but the feeling of energetic movement they produce in wall papers or drop patterns is objectionable. It annoys the eye and is usually inartistic.
CHAPTER II: FORM, COLOR AND PROPORTION
Never overemphasize one of the dimensions of height, width and depth at the expense of one of the others. They must be harmonized.
OBLONG
The proportions of any room are best when they make a normal impression on the eye. The oblong is the best decorative art form, as a rule. It can be used in nearly all ornaments, in walls, doors and windows, ceilings and floors, in rugs and furniture, because it is obvious.
THE SQUARE
The square form is solid and firm, but tends to be monotonous. Square windows, fireplaces and wall spaces, as well as square rooms in general and pictures, are usually uninteresting, and this applies to cubes as well. The big cubical chair, for instance, is something to be avoided.