In the decorative treatment of a room the importance of openings can hardly be overestimated. Not only do they represent the three chief essentials of its comfort,—light, heat and means of access,—but they are the leading features in that combination of voids and masses that forms the basis of architectural harmony. In fact, it is chiefly because the decorative value of openings has ceased to be recognized that modern rooms so seldom produce a satisfactory and harmonious impression. It used to be thought that the effect of a room depended on the treatment of its wall-spaces and openings; now it is supposed to depend on its curtains and furniture. Accessory details have crowded out the main decorative features; and, as invariably happens when the relation of parts is disturbed, everything in the modern room has been thrown out of balance by this confusion between the essential and the incidental in decoration.[19]
The return to a more architectural treatment of rooms and to a recognition of the decorative value of openings, besides producing much better results, would undoubtedly reduce the expense of house-decoration. A small quantity of ornament, properly applied, will produce far more effect than ten times its amount used in the wrong way; and it will be found that when decorators rely for their effects on the treatment of openings, the rest of the room will require little ornamentation. The crowding of rooms with furniture and bric-à-brac is doubtless partly due to an unconscious desire to fill up the blanks caused by the lack of architectural composition in the treatment of the walls.
The importance of connecting the main lines of the openings with the cornice having been explained in the previous chapter, it is now necessary to study the different openings in turn, and to see in how many ways they serve to increase the dignity and beauty of their surroundings.
As light-giving is the main purpose for which windows are made, the top of the window should be as near the ceiling as the cornice will allow. Ventilation, the secondary purpose of the window, is also better served by its being so placed, since an opening a foot wide near the ceiling will do more towards airing a room than a space twice as large near the floor. In our northern States, where the dark winter days and the need of artificial heat make light and ventilation so necessary, these considerations are especially important. In Italian palaces the windows are generally lower than in more northern countries, since the greater intensity of the sunshine makes a much smaller opening sufficient; moreover, in Italy, during the summer, houses are not kept cool by letting in the air, but by shutting it out.
Windows should not exceed five feet in width, while in small rooms openings three feet wide will be found sufficient. There are practical as well as artistic reasons for observing this rule, since a sash-window containing a sheet of glass more than five feet wide cannot be so hung that it may be raised without effort; while a casement, or French window, though it may be made somewhat wider, is not easy to open if its width exceeds six feet.
The next point to consider is the distance between the bottom of the window and the floor. This must be decided by circumstances, such as the nature of the view, the existence of a balcony or veranda, or the wish to have a window-seat. The outlook must also be considered, and the window treated in one way if it looks upon the street, and in another if it gives on the garden or informal side of the house. In the country nothing is more charming than the French window opening to the floor. On the more public side of the house, unless the latter gives on an enclosed court, it is best that the windows should be placed about three feet from the floor, so that persons approaching the house may not be able to look in. Windows placed at this height should be provided with a fixed seat, or with one of the little settees with arms, but without a back, formerly used for this purpose.
Although for practical reasons it may be necessary that the same room should contain some windows opening to the floor and others raised several feet above it, the tops of all the windows should be on a level. To place them at different heights serves no useful end, and interferes with any general scheme of decoration and more specially with the arrangement of curtains.
Mullions dividing a window in the centre should be avoided whenever possible, since they are an unnecessary obstruction to the view. The chief drawback to a casement window is that its sashes join in the middle; but as this is a structural necessity, it is less objectionable. If mullions are required, they should be so placed as to divide the window into three parts, thus preserving an unobstructed central pane. The window called Palladian illustrates this point.
Now that large plate-glass windows have ceased to be a novelty, it will perhaps be recognized that the old window with subdivided panes had certain artistic and practical merits that have of late been disregarded.
Where there is a fine prospect, windows made of a single plate of glass are often preferred; but it must be remembered that the subdivisions of a sash, while obstructing the view, serve to establish a relation between the inside of the house and the landscape, making the latter what, as seen from a room, it logically ought to be: a part of the wall-decoration, in the sense of being subordinated to the same general lines. A large unbroken sheet of plate-glass interrupts the decorative scheme of the room, just as in verse, if the distances between the rhymes are so great that the ear cannot connect them, the continuity of sound is interrupted. Decoration must rhyme to the eye, and to do so must be subject to the limitations of the eye, as verse is subject to the limitations of the ear. Success in any art depends on a due regard for the limitations of the sense to which it appeals.