I used to work in a Cetre that housed the physically disabled, and people with slight mental disablities. There was a large room in one part, that had the same tiles 1/2 way up the walls that were the same as the ones on the floor, with a large drain all the way around - apparently, all those yrs ago they used to get hosed off. Thankfully things changed when I worked there - poor prople :(

I work as a mortician, and I have to agree with Noah, it does look similar to a Trocar.