As the Milky Way passes behind the Sun in moving in unison with the foreground stars, at the end of the run the nebulae show up.
It is notable that in order to track a specific star or nebula over the course of the orbit, the C3 camera would have to turn, albeit slowly in order to maintain the specific star/nebula as a focal point whereas presently the central Sun plays that role.
It conveys the insight that the star Polaris serves as a focal point for the Earth's orbital motion and the single surface rotation of the entire planetary surface once each year with its own set of longitudes.