In what scenario will I even need an elevator that goes sideways?,(reply>), The specific case they're describing here is to have set of multiple shafts where the some shafts are for up, and some for down, meaning you can run multiple cars per shaft. For very tall buildings the problem of only one elevator per shaft and longer trips between distant floors mean that a decent fraction of taller buildings is nothing but elevator. This invention in theory let's you extend the same number of shafts to any height, though I'd probably increase shafts albeit at a much slower rate so that a failure or slowdown in one shaft can be diverted around.<br><br>In a more extreme setting you could use this for something like the previous video he made about a sideways elevator, where they just needed to go a fair ways sideways as well as up, and it was more convenient than walking.