 The main body of the tower is divided into the two @-@ storey plinth , whose exterior is made of alpine limestone , and the three @-@ storey tower shaft sheathed in sandstone . The shaft 's seemingly massive corner blocks are decorative fixtures held in place by visible iron hooks . Below the roof , the cornice spans around the still @-@ visible bases of the former corner towerlets . The two @-@ story attic is covered by the sweeping , red @-@ tiled , late Gothic spire , in which two spire lights are set to the West and East . They are crowned by ornamental urns with pinecone knobs reconstructed in 1983 from 18th @-@ century drawings . 
