In case anyone is interested in bringing this idea into their school, here are several articles that might be helpful in educating a school that is not yet familiar with this idea. I would add that although these articles are about entire classroom seating, there are also schools who have 2-3 per classroom as a seating option. It doesn't need to be "all or nothing" smile

http://www.metrowestdailynews.com/e...-balls-replace-chairs-in-some-classrooms

http://wcco.com/education/stability.ball.classroom.2.991306.html

http://www.usatoday.com/news/education/2009-03-07-class-chairs_N.htm

http://www.wittfitt.com/kansascitystar2009.pdf

http://host.madison.com/news/local/article_0b81cae3-b10f-50fc-8c16-2b652fd978a7.html