This example shows a smiling face built from primitive SVG shapes, composed of a yellow background circle, two black eyes, and a curved mouth. It demonstrates how D3 and React can be combined to create declarative, reusable components. The visualization uses React’s component model to structure the code, with `BackgroundCircle`, `Eyes`, and `Mouth` as separate functions. D3’s `arc` API generates the mouth’s path, while SVG’s `<g>` element translates all components to the canvas center. The rendering is static, with no interaction or data source beyond hardcoded dimensions.