My mind is an interesting place sometimes.
Take last night. I was dreaming, and at one point, I came up with the concept of sinks in elevators. Not tiny sinks, but full length counters with full sinks, like you would find in a master bathroom, with running water.
Then, I started working out how I would get running water and plumbing into an elevator car that traversed up and down multiple floors.
Because that’s what my brain does. Obviously, I need to work out viable engineering options for things like this in my sleep.
I came up with two fairly workable solutions before I woke up.