This example builds a smiley face using React and D3.js, rendered as SVG. The visualization shows a yellow circle with a black outline, two dark eyes, and an arc-shaped mouth. The code constructs the face by passing parameters for radius, offsets, and stroke width to separate React components. The mouth uses D3’s `arc()` API to generate a path with inner and outer radii, while the eyes and background circle are positioned relative to the SVG’s center using a transform.