A cheerful yellow circle sits at the center of an SVG canvas, representing a face. A single black arc, drawn using d3.arc, forms a mouth in the upper-right quadrant of the circle. The example renders with React 17, using JSX to create the SVG elements, while D3 v7 provides the arc path generator. The face has no eyes or other features, and the mouth arc uses an inner radius of 0 and outer radius of 100 with a fixed start and end angle.