This example displays a grid of 18 smiley faces, each with randomized eye and mouth dimensions, producing a playful variety of expressions. The faces are constructed with React components for the background circle, eyes, and mouth, rendered as SVG elements. The mouth uses `d3.arc` with a fixed angle range to create a consistent smile, while JavaScript’s `Math.random` generates the per-face variations. D3’s `range` function supplies the array of 18 iterations, and the `FaceContainer` wraps each face in an SVG group.