This example visualizes a small organization hierarchy as a force-directed graph. The data defines a main node, one child node with 20 leaf nodes, and a second child node. Using D3's `forceSimulation`, `forceManyBody`, `forceLink`, and `forceCenter` APIs, the nodes repel and connect via links, settling into a spatial layout. Three node sizes—50, 20, and 5 pixels—distinguish hierarchy levels, while SVG circles, lines, and text labels render the structure. The simulation's tick event updates node positions and link endpoints continuously, creating an animated network diagram.