Please read this entry revered, it will make more sense.
The photo with the ladder is where the plumber put the pipes for the shower, in that very wall.
Eventually the pipes were removed to the opposite wall, and that wall did become a half. What a waste of man hrs. and material.
As long as I'm talking about errors. Here's another one. That partition in the center of the picture was supposed to be a half wall in the master bath. I was assured it would be.