This example shows a classic smiley face, rendered as a single yellow circle with a black outline, two black eyes, and a wide, open mouth arc. The face is generated by combining basic SVG shapes, created with React and D3.js. It uses D3’s `arc` generator to build the mouth path, while the face and eyes are simple SVG circles. The entire composition is positioned at the center of a 960 by 500 viewBox.