This example shows the construction of a smiley face, starting with a yellow circular head and two black eyes, all rendered as SVG shapes. The face is built using React components, where the head’s radius and eye positions are computed from a fixed width and height. The code relies on React’s `ReactDOM.render` to mount the component, with the SVG elements positioned using center-based coordinates. It uses hardcoded values for the eye offset and radius, leaving the mouth unfinished as a work-in-progress.