Shape waves with your hands and hear them overlap.
Each hand is a wave source. One hand makes a wave, two hands reveal interference: where crests meet it turns bright and loud, where crest meets trough they cancel. You see the pattern and hear the beating.
MediaPipe Hands · WebGL · Tone.js · webcam permission required
How it works.
Hold one or two hands in front of the camera. Position sets the source, height sets the wavelength, an open hand sets the amplitude. A fist freezes the pattern so you can study it calmly.
What you learn.
Wavelength, amplitude and frequency can be felt one at a time. With two sources you get interference, the same principle as the double slit. Cancellation appears as a calm, dark zone and is audible as beating.
The camera stays on the device. No images uploaded, no data collected, no account needed. Without a webcam the cursor conducts a wave. Aligns with science curricula on waves, sound and light.