This example shows a React application that renders an SVG circle which follows the mouse cursor across a 960 by 500 coordinate space. The circle updates its position in real time using React’s `useState` hook to store the mouse coordinates, triggered by the `onMouseMove` event handler on the SVG element. The `useCallback` hook memoizes the event handler, and `ReactDOM.render` mounts the component into the DOM. The visualization demonstrates state-driven rendering with SVG, where every mouse movement causes a re-render that moves the circle.