A radial tree displays a hierarchical dataset of world countries, branching outward from a central root with nodes arranged by depth. The visualization supports panning and zooming to explore the structure. Built with D3 v4, it uses `d3.stratify` to parse the data, `d3.tree()` with a radial layout, and `d3.linkRadial` for curved links. Node labels rotate based on depth and angle, with font sizes decreasing for deeper levels. The scene is rendered as SVG within a fixed-size viewport.