This interactive example shows a collapsible hierarchical tree rendered as labeled, color-coded boxes connected by links. Node types are distinguished by color, and clicking a node collapses or expands its children with animated transitions. The visualization is built with D3.js v3, using `d3.layout.tree` for layout and SVG for rendering. It incorporates zoom and drag behavior via `d3.behavior.zoom` and includes custom tooltips and arrow markers. Data is loaded from a JSON file specifying nodes, links, and metadata.