This example shows a classic smiley face drawn with a yellow circle, two black eyes, and a wide mouth, centered within an SVG canvas. The face is built from primitive shapes, including circles for the head and eyes and a `d3.arc` path for the mouth, all positioned via SVG group transforms. The code uses React to render the SVG elements and the `arc` function from D3 v5 to generate the mouth’s curved outline. Static geometry is defined through numeric constants, making the face scalable and easy to modify.