A React and D3 example renders a simple smiley face as an SVG graphic, with a yellow circle head, two black eyes, and a curved mouth. The face is drawn using SVG circle and path elements within a group that uses a translate transform to center it. D3’s `arc` helper from the `d3-shape` package generates the mouth path by defining inner and outer radii and start and end angles. React 16.13.1 manages the component structure, while D3 v6.7.0 provides the arc geometry. No external data is used; all dimensions are hardcoded constants.