This example shows a hierarchical mind map exploring Leonardo da Vinci and related figures, with a custom context menu that appears on right-click. The tree layout is built using D3 v3’s `d3.layout.tree`, rendering nodes as SVG rectangles and links as paths, with data loaded from a JSON file. The context menu is implemented with D3 selections, dynamically sized based on text measurement, and uses mouse events for hover styling and dismissal. The visualization also supports zoom and drag via `d3.behavior.zoom`, and includes tooltips and animated updates.