This example visualizes the Zachary karate club social network using edge bundling, showing friendships among 34 members as curved paths arranged in a radial hierarchy. A slider adjusts edge tension, dynamically changing how tightly the bundled links curve. The visualization uses d3.cluster to compute the hierarchical layout, d3.radialLine with d3.curveBundle to draw the bundled edges, and SVG rendering for the paths and labels. Data comes from a simplified version of the networkrepository.com soc dataset, loaded via d3.json.