This example renders a smiley face using React and D3 v7, drawing circles for the head, eyes, and irises, and an arc for the mouth. Eyebrows are added as line elements, with stroke widths and positions computed relative to a central transform. The visualization is static, built with SVG inside a React component, and uses D3’s `arc()` generator to define the mouth shape. The code defines geometry constants for offsets and radii, showcasing a compositional approach to vector graphics.