A React app renders a grid of 50 randomly generated smiley faces, each with independently randomized stroke width, eye position, eye radius, mouth radius, and mouth width. The faces are composed from reusable components—`BackgroundCircle`, `Eyes`, `Mouth`, and `FaceContainer`—that build an SVG scene using d3.arc for the mouth path. This example demonstrates stateless functional React components combined with D3's arc generator to produce varied, data-driven SVG visualizations without any external data source.