A circle tracks the mouse cursor across a 960 by 500 SVG canvas, demonstrating real-time interaction with React state. The example uses React hooks (`useState`, `useCallback`) to update the circle’s `cx` and `cy` coordinates from the `clientX` and `clientY` values of the `onMouseMove` event. Rendered as an SVG circle with a fixed radius of 30, the visualization directly mirrors pointer movement without animation or data transformations.