This interactive network visualization shows hierarchical relationships between the world, continents, and countries. Nodes are categorized by shape and color: blue rectangles for World, purple circles for Continents, and green ovals for Countries. Using D3 v7, the example employs `d3.forceSimulation` with `forceLink` and `forceManyBody` to position nodes, while manually appended SVG shapes (rect, circle, ellipse) and text labels render each node. The tick event updates link coordinates and node transforms dynamically, creating a force-directed graph of six nodes and five links from simple, inline data.