A cubicle is an enclosed office that is separated from neighboring workspaces, with partitions that are usually 5–6 feet (1.5–1.8 m) tall. Its purpose is to isolate office workers and managers from the sights and noises of an open workspace so that they may concentrate with fewer distractions. Cubicles are composed of modular elements such as walls, work surfaces, overhead bins, drawers, and shelving, which can be configured depending on the user's needs. Installation is generally performed by trained personnel, although some cubicles allow configuration changes to be performed by users without specific training.