This example renders a yellow smiley face composed of modular React components: a circular background, two eyes, and a curved mouth. The components are split into separate ES6 module files and composed within a face container that centers the drawing. The mouth uses a d3 arc path with specified inner and outer radii and start/end angles. The React app passes width, height, and positioning props, while ReactDOM renders the final SVG with a fixed 960×500 viewport.