Two balls, one for each hand. Move your hands at the webcam and each ball follows one, leaking a trail of colour. Close your fingers for one big ball; open or wiggle them and it splits into thin lines from your fingertips. Pick what leaks from each below; where the trails meet, their colours blend.

Nothing leaves this tab. The camera opens only when you press the button. Hand tracking (MediaPipe) runs in your browser; no frame or position is sent or saved.