Directions for group living : considerations when making programs of requirements and designs for group livingGreetings from Christiania : material for hopeTraces of a new residential culture : account of a search for people who are trying to bring more connection into their lives and coexistence than is possible with the dominant mode of livingWalden : civil disobedienceChicago 21 : a plan for the central area communitiesThoreau and Walden : backgrounds