This visualization displays a classic smiley face rendered as a scalable vector graphic using React and D3 v7. The face consists of three circles—a yellow head with a black stroke and two black eyes—plus a mouth drawn as a D3 arc path. The code uses `d3.arc()` to generate the semicircular mouth and React’s `ReactDOM.render` to mount the SVG. All positions and radii are defined as JavaScript variables, making the face easily adjustable through constants like `eyeOffsetX` and `mouthRadius`.