Free in-browser magic-mirror scene for kids — you explore it by moving in front of the camera. No install, no account.
▶ Play now — it's freeWorks on any laptop with a webcam · nothing is recorded
18 (or 28 in VIVID) colorful pendulums hang from a mounting bar across the top of the canvas. Their periods differ slightly (T = base / (1 + i × δ)), so they all start swinging in sync at t = 0 but drift in and out of phase over the next ~60 seconds, producing classic pendulum-wave traveling patterns. A camera-motion burst resets t = 0, briefly bumps the amplitude, and the wave starts over.
🔒 Private by design: the camera feed is processed inside your browser and never leaves your device. No video is recorded, saved, or uploaded — ever.