A grid of randomly generated cartoon faces fills the screen, each with a yellow circular head, black outline, two eyes, and a D3 arc-based mouth. The example demonstrates reusable React components—BackgroundCircle, Eyes, Mouth, and Face—composed within an SVG container. D3 v7 generates the mouth paths via `d3.arc()`, while React’s `range()` from D3 creates an array of 45 faces, each with randomized dimensions for stroke, eye position, and mouth size. Rendering is entirely SVG-based without external data.