A grid of eighteen smiley faces renders in React with D3 v7, each face varying randomly in stroke width, eye size and position, and mouth dimensions. The example shows how SVG shapes compose into a reusable `Face` component using D3's `arc` generator to draw each mouth. The `FaceContainer` translates a central group, while `BackgroundCircle`, `Eyes`, and `Mouth` define the facial features. Random parameters from the `d3.range` map generate the unique faces.