This example assembles a yellow smiley face from modular React components—BackgroundCircle, Eyes, Mouth, and FaceContainer—that wrap D3’s arc generator for the mouth’s curved path. The code positions facial features via SVG circles and a path, all rendered on a 960×500 canvas using ReactDOM, with D3 loaded from a CDN. It demonstrates local ES6 module imports, state-free composition, and geometric parameters for eye offset, mouth radius, and stroke width, though no external data is used.