Eighteen identical smiley faces render in a grid, each with a randomly sized eye radius generated by `Math.random()`. The example demonstrates modular React component composition, splitting `Face`, `BackgroundCircle`, `Eyes`, `Mouth`, and `FaceContainer` into separate ES6 modules. It uses React Fragments for grouping SVG elements and the D3 `arc()` generator to draw each mouth path. The `FaceContainer` wraps the SVG group with a centered translation, while ReactDOM mounts the array of faces into the page.