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
Five (nine in VIVID) sine-wave traces scroll across a dark green grid like an old CRT scope. The waves swell with the user's motion energy (target amplitude = base + scaled energy) and decay back when motion stops. Each trace is drawn in two passes — a thick low-alpha glow and a thin bright core — for depth without shadowBlur. Hue rotates from cyan when quiet through to red-orange when loud.
🔒 Private by design: the camera feed is processed inside your browser and never leaves your device. No video is recorded, saved, or uploaded — ever.