This example shows a classic smiley face drawn with SVG elements in a React application. A yellow background circle with a black stroke forms the head, while two black circles represent the eyes and a D3 arc generator creates the mouth. The code uses React components like `BackgroundCircle`, `Eyes`, and `Mouth`, with D3's `arc()` API for the curved mouth path. All shapes are centered using an SVG `<g>` transform, and the visualization is rendered entirely through React's declarative component model.