This example renders a pie chart using D3 and React. It loads color data from a CSV file and maps each row to a thin colored div, creating a stacked bar visualization. The code uses D3’s `csv` function to parse the remote dataset, and React’s `useState` and `useEffect` to manage data loading. The page is a full-window SVG with a smiley face drawn from circles, though the active display shows the data-driven colored stripes.