A grid of 18 identical smiley faces shows how React components and D3’s `arc()` API combine to render an SVG face. The code defines reusable `Face`, `Eyes`, `Mouth`, and `BackgroundCircle` components, each taking size and position props, with random eye radius per face. A `FaceContainer` wraps the SVG `<g>` and applies a translation transform, while `ReactDOM.render` mounts the entire set into the page.