This example shows a color wheel visualization built with React and D3 v7. It loads CSV color data from a GitHub gist and renders each color as an equal-sized arc segment in a full circle using `d3.pie()` and `d3.arc()`. The SVG output is positioned at the center of a 960×500 viewport. React's `useState` and `useEffect` manage the asynchronous data loading, displaying a loading message until the CSV arrives. The code imports `csv` from D3 for data parsing and uses React DOM to render the final SVG graphic.