This interactive particle constellation visualizes 100+ colored particles that move with physics-based velocity, bounce off screen edges, and connect to nearby particles with fading lines. Particles are attracted to the mouse cursor, growing larger when approached. Built with React 19 and D3.js v7, the example uses d3.interpolateRainbow for gradient colors and requestAnimationFrame for smooth 60fps animation. Live sliders adjust particle count and connection distance, while a "Regenerate" button randomizes positions and colors through React state management.