This example shows a modular, parameterized smiley face drawn with React and SVG. A yellow circle forms the head, with two black eyes and a curved mouth generated from a D3 arc path. The code builds the face from reusable components like `BackgroundCircle`, `Eyes`, and `Mouth`, composed inside a `FaceContainer` that handles the SVG viewport and coordinate translation. The `Mouth` component uses D3’s `arc` API to create a semicircular path, while the overall face dimensions and feature placements are controlled via props passed to the `Face` component.