Design of interior spaces, closely related to architecture and sometimes including interior decoration. The designer's goal is to produce a coordinated and harmonious whole in which the architecture, site, function, and visual aspects of the interior are unified, pleasing to mind and body, and appropriate to the activities to be pursued there. Design criteria include harmony of colour, texture, lighting, scale, and proportion. Furnishings must be in proportion to the space they occupy and to the needs and lifestyles of the residents. The design of such nonresidential spaces as offices, hospitals, stores, and schools places clear organization of functions ahead of purely aesthetic concerns.