Still Turns a MacBook Lid into a Tiny Foldable-Phone Demo

Field notes

The effect depends on a readable hinge sensor rather than camera-based tracking. Still samples that sensor about 30 times per second, triggers near a 4° change, and renders a single captured frame through a Metal overlay; the page says it does not record video or audio, write to disk, or make network requests. Automatic behavior is listed for selected MacBook Pro and M2-or-newer Air models, while unsupported machines can use a manual preview.