This example renders a classic smiley face as an SVG graphic using React and D3. The code constructs a yellow circle for the face, two smaller circles for the eyes, and leverages the D3 arc generator to define a mouth shape. The visualization is built with the ReactDOM library, while D3’s `arc()` API specifies the mouth’s geometry via inner and outer radii and start/end angles. The face is centered within a fixed viewport, with all dimensions and offsets declared as constants.