This example shows a grid of fifteen smiley faces, each rendered as a reusable React component. It demonstrates how to compose SVG elements with React components and D3’s arc generator. The `Face` component composes `BackgroundCircle`, `Eyes`, and `Mouth` subcomponents, with the mouth drawn using D3’s `arc` API. Faces are generated by mapping over an array from `d3.range`, and each eye radius varies randomly per face. The visualization uses React’s declarative rendering to build SVG output, with styling applied through inline SVG attributes.