In the early 1980s, Scottish Indie jingle-janglers Orange Juice advised us all to "Rip it up and start again".1 Which has also been the prevailing credo of European architecture and urban planning for much of the past two centuries: less a case of what goes up must come down, as what goes up will come down as soon as a new use is demanded or a new spatial concept developed or a new political ideology comes to the fore. But should it? Must it? And if didn't? Questions that in recent decades
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