This example shows a smiling face built from yellow circle background, black eyes, a d3.arc-based mouth, a rectangular nose, and four rotated rectangle accents for hair and cheeks. The React components (BackgroundCircle, Eyes, Mouth, Nose) pass parameters like radius, offsets, and arc angles to render SVG elements centered on a 960x500 canvas. The d3.arc() API generates the mouth path with inner and outer radii, while all other shapes use plain SVG circle and rect tags within a transformed group.