Yet the amazing fact is that precisely none of these higher towers, bar the special case of the Gherkin, has actually been built. London's boom shot up and fell to earth completely unaided by the prestige or floor space of these argued-over skyscrapers. It would have been more useful, in the days of the overheated market, if lower, easier-to-build blocks had been put up instead. The proposed skyscrapers were economically irrelevant.