Scale is the capacity to select objects and arrange them so that they look well together. Both proportion and scale deal with the relative sizes of things. If there is a difference, proportions pertain to the relationship between the parts of a composition, while scale refers specially to the size of something, relative to some known standard or recognized constant. Scale in this sense means, that the sizes of all the elements making up the structure have a consistent, pleasing relationship to the structure and to each other and that the size of the structure is in good proportion to the different objects combined with it.
An architect while planning the house, apply the principles of scale to design the windows, doors to arches, roofs, exteriors to the height and width of the proposed building such that everything is in scale and looks pleasant.
Similarly furniture designers fabricate the furniture in scale. The maximum appearance of size may be given to a room through the use furnishings comparatively by the mass of an object to the size of room and also by the relationship of each part to every part and to the whole mass. When it is necessary to consider every aspect in detail while furnishing the home interiors to achieve scale in their arrangements.
Each article must be in scale with the room containing it and also with the other articles in the room. The various structural parts of each article must be in scale with one- another and with the whole body.