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This example demonstrates a minimal interactive React visualization: a single black circle centered in a 600×600 SVG canvas, paired with an event handler that logs mouse coordinates to the console. The application uses React’s `useState` hook for state management, though the current component renders a static circle rather than reacting to position data. Rendering is handled through React’s SVG support, with `index.html` loading React and ReactDOM from CDN and the app bundled for the browser. The code explicitly shows the `Ball.js` component, which is unused in the final render, while the main `App` component wires up the `onMouseMove` event.