A grid of 18 randomly parameterized smiley faces demonstrates component reuse in React with SVG rendering. Each face reuses the same `Face`, `BackgroundCircle`, `Eyes`, and `Mouth` components, while the D3 `arc` helper generates the mouth path. Randomized values for stroke width, eye offset, eye radius, mouth width, and mouth radius create visual variety across the grid. The `FaceContainer` wraps each face in a translated SVG group, combining React's declarative composition with D3's geometry utilities.