This example shows 50 randomly positioned and sized circles bouncing horizontally across the full screen, with a button to sort them by radius or revert to random positions. Built with React and D3 v5, it uses `d3.range`, `d3.timer`, and `d3.select` to manage SVG circle elements, while React state controls the circle data and re-renders on button clicks. The animation continuously updates the `cx` attributes as circles move, and the sort operation reorders the array before updating the DOM.