A second key theme within this perspective is the role of, and mechanisms for, behaviour control in public space. In a critical study of Los Angeles, Davis (1992) highlights several mechanisms of control, including barrel-shaped benches, sprinklers and decorative enclosures around trash dumpsters designed to keep the homeless away from specific areas. However, behavioural control in public space is not limited to the ‘undesirables’; it can also include middle-class shoppers and professionals when ‘circulation is internalized in corridors under the gaze of private police’ in shopping malls or office complexes