A yellow circle follows the mouse cursor across an SVG canvas, redrawing its center position in response to pointer movement. The visualization uses React's `useState` and `useCallback` hooks to manage cursor coordinates, which are captured via the `onMouseMove` event on the SVG element. The circle's radius remains constant at 30 pixels, while its `cx` and `cy` attributes are set directly from the mouse's client coordinates. The example demonstrates a simple interactive pattern using React's declarative rendering with SVG primitives.