The Atlantic article, "How Cities Use Design to Drive Homeless People Away" by Robert Rosenberger begins with the exhibition of metal spikes built into the floor of a corner in front of a business. This case of architechural design was implemented in order to deter the homeless away from this area. While public opinion managed to get these metal spikes removed, many other cases where architechture is used to exclude certain individuals are less obvious.
Many deterrents are only obvious to a passerby if you are affected by them. Benches or areas to sit that have what seem to be extra armrests actually prevent the homeless from laying on them for extended periods of time. Studs or large attachments to benches or edges in public space prevent skateboarders from using them to perform tricks. While architecture can be used to subtly divide communities, law and policy can be used visibly to target specific groups such as the homeless from entering unwanted areas.
Rosenberger, Robert. "How Cities Use Design to Drive Homeless People Away." The Atlantic. Atlantic Media Company, 19 June 2014. Web. 19 Feb. 2017.