A grid of eighteen randomly generated cartoon faces fills the screen, each with a yellow head, two eyes, and an arc-shaped mouth. The example demonstrates reusable React functional components, including `Face`, `Eyes`, and `Mouth`, which render SVG elements. It uses the `d3.arc` API to define mouth paths, `d3.range` to generate the grid, and random values for each face's dimensions. The `FaceContainer` component structures the SVG scaling, while `ReactDOM.render` mounts the application without animation or interaction.