This example shows a yellow smiley face drawn with React and D3 v7, rendered as SVG. The face is composed of a circular background with a thick black stroke, two eyes, and a mouth shaped as an arc. The code uses D3’s `arc` generator to define the mouth’s path, while React handles the component structure and SVG elements. The `BackgroundCircle` component is a simple circle with fixed dimensions, and the `App` component positions all elements relative to a center point. No external data is involved; the visualization is purely geometric and programmatic.