This interactive sunburst diagram visualizes the hierarchical structure of the Flare dataset, with each ring level representing a branch of the data and arc size proportional to value. Users click arcs to zoom, rotating and scaling the view via smooth transitions that animate the visible portion of the hierarchy. The D3 v5 code uses `d3.hierarchy`, `d3.partition`, and `d3.arc` to compute and draw the paths, while `transition.attrTween` interpolates arc geometry during zoom. Color is assigned per top-level category using a rainbow scale, and data is loaded asynchronously from the `@observablehq/flare` module.