Frank Lloyd Wright once looked with distaste at the sprawl that is Pittsburgh, and gave the city fathers his solemn advice: "Abandon it." Architects with the king-sized imagination of a Wright have always let one corner of the mind dwell on the impossible. Their most grandiose schemes often end up in the wastebasket, either stymied by technology or vetoed by those who regard themselves as more practical (and sometimes are). But the visionary architects go on dreaming of mushroom-shaped houses, glass pyramids and spiral cities. Last week, in a lively show called "Visionary...
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