A circle follows the mouse cursor across a full-screen SVG canvas, serving as a simple interactive pointer. The visualization also loads CSS color data from a CSV file and renders each row as a pie-shaped arc, with the arc’s fill matching the color’s hex value. Built with React hooks for state management and D3’s `csv` and `arc` utilities, the example uses an SVG path for every data point to create a static, colorful display alongside the interactive follower.