This example shows a full-screen smiley face composed of SVG shapes, with a yellow circular head, two black eyes, and a curved mouth. The visualization is built using React to manage the component structure, while D3’s `arc` generator computes the mouth’s path from inner and outer radii and angular start and end values. All coordinates are derived from the browser window dimensions, and the drawing scales to fill the viewport. The rendering relies on SVG elements such as `circle` and `path` within a transformed group.