This example shows a force-directed graph of character co-occurrence data from Les Misérables, rendered as an interactive SVG animation. It uses d3.forceSimulation to position nodes and links, with draggable circles representing characters and colored convex hulls drawn around groups of three or more nodes sharing the same group attribute. The hulls are generated using d3.polygonHull and closed curves, with a dropdown to switch between curveBasisClosed, curveCardinalClosed, curveCatmullRomClosed, and curveLinearClosed. The visualization is built with D3 v4 and React, loading graph data from a JSON file.