This example shows a modular React component tree that renders a yellow smiley face, with separate files for the background circle, eyes, and mouth. The mouth is drawn using a D3 arc generator with specified inner and outer radii and angular extents. The eyes are positioned through offset properties, while the background circle uses SVG circle elements with a yellow fill and black stroke. The code splits the visual elements into reusable ES6 modules, using React fragments to group the eyes, and imports the `arc` function from D3 v5 alongside React 16.9.