This example demonstrates a minimal interactive SVG visualization built with React and D3. A single red circle is rendered at the center of a 960×500 canvas using React’s declarative JSX syntax. The code imports the `arc` function from D3 v5, though it is not used in the final output. Mouse movement over the SVG triggers `handleMouseMove`, logging `clientX` and `clientY` coordinates to the console via the `onMouseMove` event handler. The visualization uses React 16.9, ReactDOM, and D3 v5, rendered as SVG with no external data source.