Archigram's witty and iconoclastic proposals included "Walking Cities" that moved, armadillo-like, with insouciance and self-sufficiency.
WSJ: When the Outrageous Became Mainstream
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The British art collective Archigram explored even more extreme alternatives.
FORBES: Move up http://i.forbesimg.com t Move down
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The most significant changes had occurred in the '60s, when the English group Archigram took perfect aim at the permanence and predictability of accepted architectural norms.