This example shows a classic smiling face built from D3 arc and circle primitives, rendered as SVG inside a React component. The code uses React 17 and D3 v7 (specifically the `arc` generator) to create the mouth path, while the face, eyes, and outline are plain SVG elements. The layout is positioned via a central translation transform, with hardcoded radii and offsets for the features. No data is loaded; the visualization is entirely constructed from static geometry.