tilt moves the pen across the canvas.
sound sets the brush size — quiet = fine line, loud = broad stroke.
camera sets the ink color from the average color it sees.
connection speed tints the background — slow & warm, fast & cool.
Touch the canvas to override the pen position.
Needs https:// or localhost. Tap "Begin" and grant motion + microphone + camera. iOS asks once. Speed test pulls 512 KB from Cloudflare every 15 seconds in the background.