Although interior design involves creative solutions that can be fairly subjective, a set of quantifiable design criteria has long been accepted in the industry. Specifically, such criteria deter- mine whether the design is functional and suitable for human in- habitants. Panero and Zelnick [1979] conducted a detailed study on human dimensions and ergonomics, by carefully defining met- rics such as height, width, reachable-range, and visibility, which are believed to be conducive to functional and comfortable de- signs. For example, a television should maintain a certain distance from the normal viewing area (., a sofa) depending on the di- mensions of its screen. Viewing from an oblique angle should also be avoided.
