This example shows a smiling face drawn with React and D3, rendered as an SVG graphic on a yellow circular background with black stroke. The face is built using D3’s `arc` generator to create the mouth path, while the eyes are simple SVG circles positioned relative to the center. React manages the component structure, passing radius and stroke-width props to a reusable background circle component. The code uses `d3.arc` for the mouth’s curved shape and hardcoded dimensions for the face’s layout.