The Clock Tower (Zytglogge) was the principal western door of the city (1191 - 1256) and, with its popular cosmic timetable check worked in 1530, is presently one of the primary attractions of Bern and the most seasoned checks in Switzerland. The tower clock served as the expert clock for the city of Bern and henceforth set the standard. From that point, the hours were measured which are shown on the hour stones of the canton's streets. The hour tolls, the two tower timekeepers, the mechanical figures and the cosmic clock are all determined by a typical system. The outside appearance of the tower is ruled by late-Baroque components. The vast dial is surrounded by a fresco delivered by Viktor Surbek in 1930.