If you’re looking for an exciting elevator, then you want Paternoster doorless elevators. https://youtu.be/Rvvbn7O1nus?si=kwZsCp4OtkRfhE9A
https://youtu.be/hI0klJJNLHA gives a view.
Typical is the someone wheels a large object like a trash bin or stacked boxes and then the edge catches on a landing and crushes an occupant against the top rear corner.
Why 2 or 4? The whole idea of a paternoster is that there always is a car at every floor (see the animation and videos at https://en.wikipedia.org/wiki/Paternoster_lift)
If there wasn’t, they would be really dangerous, as you could step into the elevator shaft while the nearest car was ten floors down.