A React application demonstrates mouse interaction by rendering a single circle that follows the cursor across an SVG canvas. The code uses React’s `useState` and `useCallback` hooks to track the pointer position and update the circle’s `cx` and `cy` attributes on every `mousemove` event. The circle is drawn with SVG elements, and ReactDOM renders the component into the `#root` div. No external data is loaded; the visualization simply shows real-time positional state changes.