A pie chart built with React and D3 displays the distribution of CSS named colors by their RGB values. The visualization loads color data from a remote CSV file using D3's `csv` utility and renders each color as an SVG path arc via `d3.arc` and `d3.pie`. React's `useState` and `useEffect` manage the asynchronous data fetch and state, with a loading message shown before the chart appears. The example demonstrates integration of React components with D3's geometry APIs for declarative SVG rendering.