The outgoing and incoming screens are mounted on **two faces meeting at a right angle**, and the whole cube rotates 90°. One face folds away while the other swings in, so it looks like a 3D push. Keynote's "Cube", the old iPhone home-screen page swipe and Swiper's cube effect all work this way.
`perspective` is the key. Too small and distortion becomes nauseating; too large and it is indistinguishable from a flat slide. The rotation axis (`transform-origin`) must sit at the cube centre's depth or the faces will separate.
It is attention-grabbing, so it tires with repetition. Reserve it for **showmanship**, not for conveying information.
When to use
Use it for presentation openers or portfolio galleries where showmanship is the goal. Avoid it for repeated navigation in work apps.