This example renders a classic smiley face using React and D3’s `arc` generator within an SVG. A yellow circle forms the head, with two black circles for eyes and a mouth drawn as an arc path. The D3 arc builds the mouth shape from specified inner and outer radii and start and end angles, while React manages the component structure and SVG elements. Hardcoded dimensions and offsets define the face’s proportions, and the code uses React’s `ReactDOM.render` to mount the visualization.