A grid of 18 smiley faces renders in React with SVG, each face generated with randomized eye offsets, eye radii, and mouth dimensions. The face components compose reusable subcomponents—BackgroundCircle, Eyes, Mouth, and FaceContainer—to build the layered SVG structure. D3's arc generator creates the curved mouth path, while the spread of faces shows how varying parameters produce distinct expressions. The rendering uses ReactDOM to mount the app and d3.range to generate the face array.