Four hundred twenty rainbow-colored circles spiral outward from the center of an SVG canvas, positioned using the golden angle and square-root scaling to form a galaxy-like pattern. Each circle expands from a radius of zero in a staggered transition, then gently pulses in size through a recursive `pulse()` function using `d3.easeSinInOut`. The visualization uses D3 v7’s selection, data join, and transition APIs, with colors generated via `d3.interpolateRainbow` on a light green background.