I am indeed the owner of this art installation. My first place, moved in in August.
It's a solid 30's block, and those pillars and a lot of the ceiling are concrete so would be a bugger to chase these in. They were previously contained within a real cheap plastic casing running all over the ceilings - it actually looked a whole lot worse. I'm quite happy with it now.
The place was modified at some point though without planning permission, a room was removed to open it out, so I suspect that also has something to do with it.
This bit in the living room is great.