A grid of 18 randomly generated smiley faces fills the viewport, each rendered as a scalable vector graphic with a light blue background circle, black-outlined eyes, and a mouth shaped by an arc generator. The code builds each face from reusable React components, including `FaceContainer`, `BackgroundCircle`, `Eyes`, and `Mouth`, and uses D3's `arc` API to compute the mouth path. Each face randomizes its eye radius and fill color using `Math.random` within the `App` component, while all faces share fixed dimensions and offsets.