The whole subject is complicated by convention; thus for convenience, forms are drawn in outline, but these drawings are not representations, and are only recognisable and accepted as such through education and tradition. Drawing in outline is merely to sequestrate a portion of the surface by a line or lines, and can only define at most two dimensions. When shade and shadow are added there is some approximation to the solid in the suggestion of the third dimension. Though these tend to a more lucid explanation, the work remains a convention if colour and atmosphere are rendered in monochrome. It is generally assumed that appreciation for colour is inherent. That this to some extent is true is evident in the attraction of bright colour to the child and the savage. Subtle quantities and combinations are only appreciated by comparatively few, the faculty for colour being extremely rare. _Influence of Fashion_ The average individual is guided as a rule in colour selection by vogue or fashion, though it is the polite custom to concede that the average woman is naturally endowed with taste. This is delicate ground, but the awful and impossible associations evident at times in feminine costume certainly do not justify the courtesy. There are superstitions in colour selection evidently the result of tradition, such, for instance, as red and yellow being suitable for a sallow complexion. The actual effect of these colours being to excite the complementaries, is hardly favourable to the misguided wearer. The average man is generally more discreet in selection when sartorially concerned. Not that he necessarily possesses more taste, but because he is observant of custom, and moreover, has generally an instinctive dislike to anything pronounced. At times, however, the women-folk take the initiative, and two of the greatest inflictions that men suffer are the selection of their ties and cigars by one of the opposite sex. In domestic environment the selection is invariably imitative or guided by fashion, and if the prevailing vogue prescribes brown paper as a lining for walls, it is probably adopted. But the choice, however it may be influenced, is made possibly without thought of the furniture and upholstery that is associated. _Harmonious Consistency_ The colour scheme should be determined by aspect and by the use of the particular apartment. A sunny room should be treated differently to one with a north-east aspect, in which an appearance of warmth is desirable. Furniture, too, must be considered, reds being an unsuitable setting for oak as a rule, while mahogany is best associated with delicate greens and greys.