(Potentially OT) Huh, I thought the point of those is saving water and encouraging people to wash hands after using the toilet. How do these prevent vandalism (of the sink or of the toilet?) and/or self-harm?
Ah, I might have seen some other variants of the same concept (I saw them in toilets in Japan with no rhyme or reason that I could discern as to which ones would have them and which would have a separate sink).
@robryk When I lived in Germany one apartment I lived in had a one-piece molded PCV bathroom, the whole thing -- sink, toilet, and shower -- was one big piece of molded plastic. To clean the bathroom I could just spray the flexible shower all over the place.
@robryk I would guess it is the single non-ceramic unit makes it harder to break and get pieces off of, there's no exposed plumbing, etc. And that is how they are marketed to jails so I guess you'd have to ask a manufacturer about that selling point.