This interactive zoomable sunburst visualizes hierarchical data from the ObservableHq flare dataset, showing the nested structure of a software project’s modules and their sizes. Clicking on a ring segment zooms into that subtree, smoothly animating the partition layout via D3 v5’s `transition` and `attrTween` methods. The visualization uses `d3.hierarchy`, `d3.partition`, and `d3.arc` to compute geometry, with colors assigned per top-level category via `d3.scaleOrdinal` and `d3.interpolateRainbow`. SVG paths and text labels render the rings, with fill-opacity and label visibility toggling based on the current zoom level.