A fork of Smiley Face Part II shows a single unfilled circle following the mouse cursor across an SVG canvas. The circle's position updates in real-time based on the pointer's client coordinates. Implemented with React and D3 v7, the visualization uses React's `useState` and `useCallback` hooks to manage and update the mouse position state, while the SVG `<circle>` element renders the shape. The HTML loads React and D3 from CDN, and the code runs within a React component rendered to the root div.