This example shows a classic smiley face composed of a yellow circle, two eyes, and a curved mouth, all centered on a 960 by 500 pixel SVG canvas. React is used for the component structure, while D3’s `d3.arc` generates the mouth path. D3’s selection API (`d3.select`, `append`, `attr`) creates the SVG elements and positions the facial features. The face and eyes use explicit stroke and fill attributes, while the mouth’s arc is defined by inner and outer radii and start and end angles.