This example renders a smiling face using React and D3 v7, drawing a yellow background circle, two eyes, and a mouth arc onto an SVG canvas. The face is centered at 960×500 pixels, with components defined as reusable functions (`BackgroundCircle`, `Eyes`) and the mouth generated via `d3.arc()`. The code sets explicit dimensions for eye offset, eye radius, and mouth width, then applies a transform to position everything around the center point. The visualization demonstrates a simple, programmatic composition of geometric shapes without external data.