This interactive tree visualization displays the hierarchy of muscle car models, from the root “Muscle Cars” through brands like Ford and Dodge down to specific variants such as the Hellcat and SRT. Built with D3 v3, it uses `d3.layout.tree` to compute node positions and renders the structure as SVG rectangles with color-coded types, connecting links, and drop-shadow filters. The visualization supports zooming and panning via `d3.behavior.zoom`, and includes animated expand/collapse on node click, with tooltips and custom styling defined in external CSS and JavaScript modules.