This React and SVG example displays a single circle that follows the mouse cursor across a 960 by 500 canvas. The circle’s position updates in response to mouse movement events, initially centered on the screen. The application uses React’s `useState` and `useCallback` hooks to manage the cursor coordinates, and ReactDOM renders the SVG element with an `onMouseMove` handler. The visualization demonstrates real-time interaction by directly mapping the cursor’s client coordinates to the circle’s `cx` and `cy` attributes.