does anyone know what this is called?

This is likely to be a dumb query, however what’s it referred to as when a mattress is constructed right into a wall like this? Each time I attempt to look it up, a “Murphy mattress” or “Wall mattress” present up and that’s NOT what that is. These beds fold out of the wall to put flat, whereas this one lays flat INSIDE of the wall. It’s killing me rn, as a result of there needs to be a reputation for this lol. (additionally I scribbled out the mess on the cabinets up there bc we’re in the course of cleansing and reworking so it’s hella ugly rn 😭).