This example demonstrates a simple interactive visualization where a circle follows the mouse cursor across the screen. The circle’s position updates in real-time as the user moves the mouse, with its center coordinated to the cursor’s coordinates. The code uses React with the `useState` and `useCallback` hooks for state management, and renders the circle as an SVG element. The `onMouseMove` event handler captures the cursor position and updates the circle’s `cx` and `cy` attributes.