This example renders a classic smiley face as a React component, using SVG for display. It builds the face from primitive shapes: a yellow circle for the head, black-stroked eyes, and a mouth drawn with the D3 `arc` generator. The D3 arc creates a semicircular path by specifying inner and outer radii, a stroke width, and start/end angles, while React manages the SVG elements and JSX markup. The visualization demonstrates a minimal integration of D3’s geometry utilities with React’s declarative rendering in a static, non-interactive diagram.