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"TreeHugger has referred to Archigram, the group of British Architects and students out of the AA (Architectural Association School)  that came up with plug-in cities, walking cities, blow-up cities and other ideas"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/modular-design/archigram-redux-more-ideas-from-the-sixties-are-fashionable-again.html>