An interior and spatial designer is involved in the design or renovation of internal spaces, including structural alterations, furnishings, fixtures and fittings, lighting and colour schemes. Designs and feasibility studies are produced for commercial, leisure and domestic properties, and the designer oversees the project from beginning to end. Interior and spatial designers work in a range of different commercial or domestic settings. The job combines the efficient and functional use of space with an understanding of aesthetics. Some designers, particularly in the domestic market, are concerned solely with the appearance, rather than the structure, of the interior.