This example displays the full set of CSS named colors as a color wheel, with each color occupying a slice of a circular pie chart. The code loads CSV data from a GitHub gist using `d3.csv` within a React component, managing the asynchronous data with `useState` and `useEffect`. It then uses `d3.pie` and `d3.arc` to compute the slice geometries, rendering each slice as an SVG `<path>` filled with its corresponding hex value. The original manual arc calculation is replaced by the D3 pie layout.