Confetti Celebration
Up to 1200 instanced confetti squares and 24 curved streamer ribbons tumble down through colored spotlight beams. Each piece falls, spins on three axes, and drifts sideways on its own sine-wave phase, looping back to the top once it passes the floor to keep the celebration endless.

• 1200-instance InstancedMesh with per-piece vertex colors
• 24 tube-geometry streamer ribbons swaying independently
• Per-instance fall speed, spin rate and sway phase/amplitude
• Two pulsing point lights simulate party spotlights
• Auto-orbiting camera when idle, OrbitControls otherwise