Animated SVG composition of 300 rectangles and 300 circles, rendered with D3 v6 in a React framework. Rectangles initially draw as thin gray strokes, then transition to transparent fills with pink outlines before expanding to fill the entire canvas. Circles begin as large transparent rings with thin white strokes that thicken, then shrink to small points while drifting downward. Transitions sequence over 15-20 second durations, creating a slow rhythmic interplay of shape transformations across the 960x500 viewport.