This example shows a simple smiley face built from reusable React components, rendered as SVG. The face consists of a yellow background circle, two black eyes, and a mouth drawn as an arc path. The code uses React function components to compose the face from separate parts, with D3’s `arc()` generator creating the mouth shape. Layout constants like center coordinates, eye offsets, and radii are defined in the parent component and passed down as props, while a container component wraps everything in a centered SVG group.