A grid of 18 randomly varied smiley faces fills the screen, each rendered as a standalone SVG via React. The faces use d3's `arc` generator to draw the mouth shapes, while eye size, mouth width, and stroke thickness vary per face. The code builds each face from modular components (`BackgroundCircle`, `Eyes`, `Mouth`) and uses `d3.range` to iterate over the grid, with all layout centered through a shared `FaceContainer` component.