A grid of 18 randomly generated cartoon faces, each rendered as a yellow circle with black outline, two eyes, and an arched mouth. The example uses React to instantiate multiple `Face` components, each composed of `BackgroundCircle`, `Eyes`, and `Mouth` subcomponents, which build SVG elements. The `Mouth` component leverages d3’s `arc()` API to compute the path for a smile, with randomized dimensions for facial features.