This example builds a smiley face from modular React components rendered as SVG shapes. Yellow background, black eyes, and a curved mouth are positioned with a central `<g>` transform. The mouth uses a `d3.arc` path generator with inner and outer radii, while the eyes are simple offset circles. React 17 manages the component hierarchy, and d3.v5 provides the arc calculation. The SVG canvas is 960 by 500 pixels, with all elements drawn in proportion to the center point.