This example renders a yellow smiley face using React and D3.js, with SVG circles for the face and eyes and a D3 arc generator for the mouth. The shape is centered in a 960-by-500 viewport, with a black stroke around the yellow background circle. It demonstrates how React components integrate with D3’s `arc` API to build static geometric visuals from hardcoded dimensions. The mouth path is created via `arc()` with specified inner and outer radii and angular extents, while the eyes and background are plain SVG elements.