This example shows a simple smiley face rendered as a yellow circle with two black eyes and an arc-shaped mouth, centered on a 960×500 SVG canvas. It demonstrates how to combine React components with D3’s `arc` generator to create reusable geometric shapes, using React to manage the SVG elements and D3 only for the mouth path’s angular calculations. The drawing is static, with all positions and dimensions defined as constants such as `eyeOffsetX` and `mouthRadius`, and uses React’s `render` method to mount the SVG into the DOM.