After that, in 1090, Su Sung made a clock on the order of Ting Zong. This clock was 30 feet tall and keep track of the time. On the top was a spherical astronomical instrument used to measure the star and driven by the clock's giant water-powered mechanism. Inside the tower was a small heavenly globe. On the front of the tower was a pagoda-like structure of five floors, each housing has many wooden puppets. The puppets would appear about every quarter of an hour day and night, and would play drums, bells, gongs and string instruments. All the puppets movement were controlled by the clock's machinery.