This interactive tree visualization displays a hierarchical dataset of patient appointments and their statuses, using a radial layout where nodes collapse and expand on click. The D3.js v3 library (d3.layout.tree, d3.behavior.zoom) renders the hierarchy as an SVG with animated transitions, while nodes marked with the "blinkred" CSS class blink to indicate urgent cases. Hovering over nodes reveals patient or room details in the adjacent panel, populated from the included flare.json data source.