This example renders a smiling face as a reusable React component, showing how SVG elements compose into a simple data visualization. The face is drawn with a yellow background circle, two black eyes, and a curved mouth, all positioned relative to a central point. The code builds the face from modular React components—BackgroundCircle, Eyes, and Mouth—within a FaceContainer that sets up the SVG coordinate system. The mouth uses the d3 arc generator to create its curved path, while React manages the SVG rendering and prop-based customization of size and positioning.