This example uses React to render an SVG circle that follows the mouse cursor across the screen. The `index.js` file initializes a React state hook with the circle’s coordinates, then updates that state on every `onMouseMove` event triggered on the SVG element. The circle’s position is bound directly to the current mouse coordinates via the `cx` and `cy` attributes, with a fixed radius of 30 pixels. The visualization relies on React’s `useState` and `useCallback` hooks, along with `ReactDOM.render` to mount the component.