They really don’t have much in common, but seeing Santiago Calatrava’s great building Turning Torso in Malmø, Sweden gave us the same sensation of clarity and wonder we experienced at Le Courbusier’s chapel at Ronchamp and Erich Mendelsohn’s astonishing Einstein Tower in Potsdam. Architecture requires so many things to come right on the day that when it happens it feels like magic. And in this case Calatrava was the magician.