A yellow circle follows the mouse cursor across an SVG canvas, acting as a simple interactive smiley face without facial features. The React component tracks pointer movement via the `onMouseMove` event and updates the circle’s center coordinates using the `useState` hook. The visualization uses React 17 and renders directly to SVG, with the circle’s position tied to the browser’s clientX and clientY values. No external data is loaded; the graphic responds purely to user input in real time.