A small SVG circle follows the mouse as it moves across a 960-by-500 canvas, updating its position live in response to pointer events. The visualization is built with React (16.9.0) and uses the `useState` and `useCallback` hooks to track and update the mouse coordinates, which are passed as the circle’s `cx` and `cy` attributes. The rendering remains minimal, with no data source or additional interaction beyond the direct mouse tracking.