This example shows a simple smiling face rendered as SVG shapes, composed of a yellow background circle, two black eyes, a red nose, and a mouth drawn as an arc path. The face is centered using a translated `<g>` group within a 960×500 SVG viewport. It uses React components (`BackgroundCircle`, `Eyes`) to structure reusable parts, while the mouth is generated with the `d3.arc()` function from the D3 v7 library, specifying inner and outer radii and angular extents.