Herr Thiessen's clock - In the novel Herr is asked to create a clock for someone. The clock is placed in the middle of the circus. This clock can represent how time is the center of the novel. It helps create a path for people, but sometimes people destroy it.
An armillary sphere (variations are known as spherical astrolabe, armilla, or armil) is a model of objects in the sky (in the celestial sphere), consisting of a spherical framework of rings, centred on Earth, that represent lines of celestial longitude and latitude and other astronomically important features such as the ecliptic. As such, it differs from a celestial globe, which is a smooth sphere whose principal purpose is to map the constellations.
Richard Glynne (18th century) Armillary sphere-orrery, ca. 1720 This instrument is a combination of an armillary sphere and a new kind of planetarium called an orrery. It demonstrates the structure of the Copernican universe.