This example shows a smiling face rendered as a scalable vector graphic, with a yellow circular head, two black eyes, and a curved mouth. The face is drawn using React components that produce SVG elements, while the mouth’s arc is generated with the D3 `arc` function, which specifies inner and outer radii and start and end angles. The code uses `d3` v5 and React 16, positioning the face elements relative to a central point via SVG transforms.