This example shows a classic smiley face rendered in an SVG canvas. The face is composed of a yellow background circle with a black outline, two black eyes, and a mouth that is drawn as an arc using `d3.arc`. The visualization is built using React components, with the SVG elements generated declaratively. The code defines the face’s geometry—circle radii, eye offsets, and mouth dimensions—as variables, and positions the entire face within a centered group transform. The composition relies on React’s component model, while the mouth shape is created through D3’s arc path generator.