This circle pack visualization maps a subset of the DBPedia ontology, showing hierarchical relationships between classes like YAGO categories and time intervals. D3’s `stratify` and `pack` layouts compute the nested circle layout, with node depth driving a grayscale gradient and area encoding instance counts. The interactive view supports zooming via `d3.zoom`, while labels render with scaled font sizes based on circle radius. Data originates from a GitHub Gist containing SPARQL query results.