This example shows a smiley face composed of a yellow circular background, two black eyes, and a curved mouth with dimples, all rendered as SVG elements. The React components `BackgroundCircle`, `Eyes`, and `Mouth` accept props for radius, stroke width, eye offset, and mouth arc dimensions. The mouth uses D3’s `arc()` generator to create the path, with the dimple arcs rotated via SVG transforms, while the face is centered using a group translation.