Named CSS colors are rendered as a layered semicircular fan of SVG paths, with each path filled according to its RGB hex value from a CSV dataset loaded via `d3.csv`. The example demonstrates combining React state management (`useState`, `useEffect`) with D3's `arc` generator to compute path geometries. React handles the component lifecycle and DOM updates, while D3 fetches the data and supplies the `arc()` shape for each color entry, producing a dense, colorful visualization that fills the viewport. The chart spans from a 90-degree to a 270-degree angle, radiating outward from the center.