A yellow circle follows the cursor across a blank SVG canvas, updating its position in real time as the mouse moves. The visualization demonstrates event-driven interaction in React, using the `useState` hook to track mouse coordinates and `onMouseMove` to capture pointer movement. The circle’s center (`cx`, `cy`) is bound to the state, and React re-renders the SVG element on each mouse event. The example relies on React’s declarative rendering, with the SVG viewport set to 960 by 500 pixels and a fixed circle radius of 30.