This example shows a React-based interactive face built with SVG. A single circle is rendered inside a 960 by 500 pixel SVG element, and its position is updated in real-time based on the mouse cursor's coordinates. The implementation uses React's `useState` and `useCallback` hooks to manage the mouse position state and handle `onMouseMove` events. The SVG circle is redrawn with new `cx` and `cy` attributes as the mouse moves, while the `ReactDOM.render` function mounts the application into the root HTML element.