A large smiley face fills the browser window, drawn with SVG shapes: a white circular head, two outlined eyes with gray irises, small nostrils, and a curved mouth formed by two arc paths. The visualization is built with React and D3, using the `arc()` generator to define the mouth’s annular sectors, while all positions and radii are computed from the viewport dimensions. The code uses React’s `render()` to mount the SVG and D3’s geometry API for the arc paths, with styling handled via SVG attributes and stroke properties.