# The Hierarchical Structure of the Census Data
Many objects in the Census Database can be subdivided into multiple levels, such as entire buildings, volumes of drawings, books, or location records. The records of the Object Types [Antique Monuments,](/using-census-data/data-in-the-census-records/antique-monument-records.md) [Postclassical Works](/using-census-data/data-in-the-census-records/postclassical-work-records.md), [Bibliography](/using-census-data/data-in-the-census-records/bibliography-records.md), and [Location](/using-census-data/data-in-the-census-records/location-records.md) are therefore organized according to a hierarchical structure.
For example, individual columns of the Pantheon are structurally subordinate to the building and are further subdivided into their individual sections:
Similarly, in the case of a Postclassical Work, the pages of a sketchbook are subordinate to the volume as a whole, and pages are further subdivided into sections.
As is shown below, to ensure that the hierarchical structure of a record is visible, it is important that the 'Show hierarchy' button at the top left of the Detail view is activated:
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