This example presents an interactive tree map of Wikipedia article connections, starting from the “Drug policy of South Korea” page and branching into related topics. Users can click and drag to pan, scroll to zoom, and click nodes to explore. The visualization uses D3 v6’s `d3.tree` and `d3.linkHorizontal` to draw the hierarchy, while SVG `foreignObject` elements display node labels that expand into full article summaries on mouseover. The data comes from the JSON file `flare-2.json`, and animated transitions adjust node and link positions with `transition.attrTween`.