Experiment
Split-flap panel
Mechanical Solari departure boards, recreated in the browser with plain DOM elements and CSS 3D transforms.
Mechanism
Alphabet cycle
Frozen at −45°
Under the hood
Each character is a single slat: a static panel plus two halves that fold down and back up, about 110 milliseconds per flip. To reach a new letter it walks forward through the alphabet one step at a time, the way a real chain-driven board does, so you watch the letters in between fly past. It is all regular DOM elements and CSS 3D transforms, with no canvas or video.
Try it
Use it
Install