A smiley face rendered as an SVG follows the user’s cursor across a 960×500 canvas. The React app uses the `useState` and `useCallback` hooks to track mouse coordinates from an `onMouseMove` event, updating a single circle’s `cx` and `cy` attributes in real time. The circle’s radius is fixed, with no additional facial features or animation. The visualization demonstrates basic interactive SVG rendering with React, where the data—the mouse position—directly drives the graphical output.