With homelessness becoming an increasing problem, many cities are implementing architectural designs in their parks and public places in an attempt to drive away the homeless. Whether it's sprinklers timed to go on in intervals throughout the night or benches with arm rests in the middle so the homeless cannot lie down. http://english.ohmynews.com/articleview/article_view.asp?article_class=&no=321234&rel_no=1 http://architectures.danlockton.co.uk/2006/10/05/anti-homeless-benches-in-tokyo/ Some of these devices are just funny. "Anti-sit" architecture involves putting sharp spikes or protruding metal pegs to prevent the homeless from sitting down. http://architectures.danlockton.co.uk/2006/05/12/the-anti-sit-archives/ Some of the methods get down right creative: http://sanfrancisco.cbslocal.com/20...at-keeping-homeless-away-from-sf-music-venue/ http://articles.sun-sentinel.com/20...329_1_stranahan-park-flower-mayor-jack-seiler http://www.ehow.com/about_4706652_urban-design-homelessness.html http://www.whatsonshenzhen.com/news...e-for-using-spikes-to-keep-homeless-away.html This is an interesting article about the sociology of public places: http://everything2.com/user/kowalski/writeups/The+Militarization+and+Privatization+of+Public+Space Benches in Honolulu bus stops were swapped out for round, concrete stools. Sarasota, Florida got rid of all the benches in its city parks. Manteca, California changed the sprinkler schedule from day to night in order to water any homeless who tried to sleep in a local park. The city of Minneapolis installed "bridge rods" -- pyramid structures meant to keep the homeless from sleeping under bridges. It hasn't worked -- apparently it helps people store their stuff -- but the effort costs the city $10,000 a year.