A grid of 18 yellow smiley faces, generated as React components, fills the viewport. Each face uses SVG shapes for a circular background, two eyes, and a mouth drawn with a d3.arc path. The `Face` component composes a `BackgroundCircle`, `Eyes`, and `Mouth` inside a `FaceContainer`, with random eye radii varying per face. The code relies on React for component structure, d3 for the arc generator and `range` utility, and renders entirely as inline SVG.