 In France, the column developed in complexity by having a cluster of circular shafts grouped around the central circular core.This is seen a Rheims, Amiens and Bourges Cathedrals, and also at Westminster Abbey and Salisbury Cathedral and in Spain at Burgos Cathedral.The rectangular piers also developed, with attached shafts and mouldings which continue up the wall to support the vault, or into the decorative mouldings of the chancel arch, in a manner that had previously been utilised to decorate the arches of Romanesque portals.