The redevelopment plan for Schuman Square at the heart of the EU quarter in Brussels was very ambitious. From a traffic-clogged, nondescript roundabout, it would become “an urban agora”, a greener, calmer meeting place, nothing less, said a former head of the Brussels government, than “a symbol that beats as the heart … of the European project”.

It did not turn out that way. The result, say critics, is Europe’s largest frying pan, a concrete expanse with little greenery or shade. While the number of cars has reduced and the space is remodelled with smart grey paving, the centrepiece – a steel canopy with a green roof – was never built.