This example renders a cheerful smiley face using React and D3.js. It draws the face’s yellow head, black eyes, and a curved mouth as SVG elements, with the mouth path generated by D3’s `arc` function. The code declares constants for dimensions, eye placement, and mouth radius, then composes the visual within a React component that is mounted into the DOM via `ReactDOM.render`. The SVG is centered on a 960×500 canvas.