Archigram's witty and iconoclastic proposals included "Walking Cities" that moved, armadillo-like, with insouciance and self-sufficiency.

WSJ: When the Outrageous Became Mainstream

The British art collective Archigram explored even more extreme alternatives.

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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.

WSJ: When the Outrageous Became Mainstream