This example displays a hierarchical dataset as an interactive rectangle tree, where each node is represented by a labeled box and connected by curved links. Clicking a node expands or collapses its children, with smooth 250ms transitions animating the layout and updating the view. Built with D3 v6, it uses `d3.tree` and `d3.linkHorizontal` for the graph structure, while SVG elements and a zoom behavior handle rendering and navigation. The data comes from the flare-2 JSON file, with node size and spacing defined by the layout.