Animated circles in navy float across the screen, their sizes and vertical positions oscillating smoothly in a wave-like pattern that changes over time. The number of visible circles also fluctuates rhythmically, creating a dynamic, generative composition. Using D3.js v6 with SVG, the code computes coordinates from trigonometric functions and a time variable within a `setInterval` loop. It employs the data-join pattern with `.selectAll`, `.data`, and `.join` to update circle attributes continuously, demonstrating D3's core selection mechanics in a responsive full-viewport canvas.