A grid of 15 faces, each with randomized facial features, demonstrates how React components can be broken into modular files. Each face uses a yellow background circle, two eyes, and an arc-based mouth, with positions and sizes varying per instance. The code splits rendering into separate components like `FaceContainer`, `BackgroundCircle`, `Eyes`, and `Mouth`, using React fragments and ES6 modules. It leverages ReactDOM to render the SVG faces, while the `arc` API from d3 generates the mouth paths.