This example uses React and D3 to render a smiley face as a scalable vector graphic. It draws a yellow head, two black eyes, and a mouth using SVG primitives. The mouth is created with D3’s `arc` generator, which produces a path with specified inner and outer radii and angular range. The face is centered within a 960 by 500 viewport, with all components positioned relative to the center using an SVG group transform.