A colorful grid of thin vertical rectangles fills the screen, each one continuously rotating 360 degrees via the Web Animations API’s `Element.animate()`. A large white circle overlays the center, while a second set of horizontal rectangles, masked by an SVG `mask` containing a circle, reveals only inside that circular region. The piece generates random RGB fill colors for each vertical bar and uses a fixed count of 200 elements, with SVG attributes and styles set imperatively through JavaScript. The animation runs infinitely with a 2000-millisecond duration per rotation.