The Public School: La Ivan Illich
THE PUBLIC SCHOOL is a school with no curriculum. At the moment, it operates as follows: first, classes are proposed by the public (I want to learn this or I want to teach this); then, people have the opportunity to sign up for the classes (I also want to learn that); finally, when enough people have expressed interest, the school finds a teacher and offers the class to those who signed up.
San Juan
http://sanjuan.thepublicschool.org/about