and Kaspar Haldenstein in 1607–1610, who introduced the large clock faces that now dominate the east and west façades of the tower. The corner towerlets were removed again some time before 1603. In 1770–1771, the Zytglogge was renovated by Niklaus Hebler and Ludwig Emanuel Zehnder, who refurbished the structure in order to suit the tastes of the late Baroque, giving the tower its contemporary outline. Both façades were again repainted in the Rococo style by Rudolf von Steiger in 1890. The idealising historicism of the design came to be disliked in the 20th century, and a 1929 competition produced the façade designs visible today: on the west façade, Victor Surbek's fresco "Beginning of Time" and on the east façade, a reconstruction of the 1770 design by Kurt Indermühle. In 1981–1983, the Zytglogge was thoroughly renovated again and generally restored to its 1770 appearance. In the advent season and from Easter until the end of October, it is illuminated after dusk. Name The Bernese German Zytglogge translates to Zeitglocke in Standard German and to time bell in English; 'Glocke' is German for 'bell', as in the related term 'glockenspiel'. A "time bell" was one of the earliest public timekeeping devices, consisting of a clockwork connected to a hammer that rang a small bell at the full hour. Such a device was installed in the Wendelstein in Bern – the tower of the Leutkirche church which the Münster later replaced – in 1383 at the latest; it alerted the bell-ringer to ring the tower bells. The name of Zytglogge was first recorded in 1413. Previously, the tower was referred to as the kebie ("cage", i.e., prison) and after its post-1405 reconstruction, the nüwer turm ("new tower"). Exterior External structure The Zytglogge has an overall height of , and a height of up to the roof-edge. Its rectangular floor plan measures . The wall strengths vary widely, ranging from in the west, where the tower formed part of the city walls, to in the east. The outward appearance of the Zytglogge is determined by the 1770 renovation. Only the late Gothic cornice below the roof and the stair tower are visible artifacts of the tower's earlier history. 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