But with terrible irony, the replacement housing itself gradually became a blighted locus of social problems.

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The UN's Top Ten list of "slum upgrading actions" ranks "installing or improving basic infrastructure" as No. 1 and makes no reference to government-subsidized replacement housing.

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Among those attending the meeting was Vera Waylor, 89, a resident of Bowles Lodge in Hawkhurst, which is earmarked for replacement by extra-care housing.

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Larry Summers, Barack Obama's main economic adviser, has noted that current annualised vehicle sales of about 9m are well below the 14m necessary for replacement and rising population, while annualised housing starts are about a quarter of the rate needed to support the forming of new households.

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Less than three years later he was already fretting about the housing bubble losing steam and the absence of a clear replacement.

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He said he acknowledged that he had received the Deputy's resignation as housing minister and he would bring forward his nomination for a replacement at the next States meeting.

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Disruptions and revolutions are quick and often violent, but I wonder if structurally what happens in these situations is the spontaneous replacement of an old central structure (the shaft) with a new exoskeleton (the housing of the engine itself) that can contain an energetic process of a higher order than the old structure could metabolize.

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