This example shows a grid of fifteen smiley faces, each with randomized eye and mouth sizes, rendered as yellow SVG circles with black outlines. Built with React and D3 v7, the visualization uses reusable components like `FaceCircle`, `Eyes`, and `Mouth` to compose each face. The `Mouth` component leverages D3's `arc` generator to create a curved smile path, while the `FaceContainer` wraps the SVG elements and centers them via a translation transform.