This example renders a grid of smiley faces using React components and D3’s arc generator. Each face consists of a yellow background circle, two black eyes, and a mouth drawn with `d3.arc()`, all composed inside an SVG via a shared `FaceContainer` that applies a translation transform. Fifty faces are generated with randomly varying eye radii, producing subtle visual differences. The code demonstrates component reuse, D3’s `arc` API for path generation, and React’s rendering of SVG elements.