This interactive React application renders a single yellow smiley face as an SVG graphic. The face initially appears centered on a 960 by 500 pixel canvas. The visualization tracks the user's mouse movement across the canvas, using the `onMouseMove` event to continuously update the position of a small black circle. This secondary circle follows the cursor in real time, demonstrating basic state management with React’s `useState` hook and dynamic SVG attribute updates via `ReactDOM`.