This example shows a smiley face rendered as a single SVG graphic, constructed with React and D3. The face is built from basic geometric shapes: a yellow circle for the head with a black stroke, two filled circles for eyes, and a D3-generated arc path for the mouth. React composes the SVG elements, while the `arc()` API from d3 defines the mouth’s curved path, specifying its inner and outer radii and start and end angles. The SVG canvas is fixed at 660 by 500 pixels, with the face centered through an SVG transform.