This example displays a simple smiley face composed of a yellow circle with a blue stroke, two eyes, and a curved mouth, all rendered using React and D3.js within an SVG. The visualization centers the face using a translated `<g>` group, while the mouth is generated with the `d3.arc()` function using specified start and end angles. The code imports `arc` directly from D3 v6 and uses React components to define each facial feature, demonstrating a functional approach to combining React's declarative UI with D3's geometric utilities.