It seems as if the art exhibit hasn’t been finished.
We see two rectangular mirrors set up at 90 degree angles to each other. In front of them are various objects, including a ladder, a bucket, cardboard boxes, blue overalls, and two rolled-up works of art. But the artwork relies on you standing in a specific place to see this, because there are no mirrors. (Click image to enlarge.)
Sinta Werner’s 4xDoublefixed / Classic Aluminium (2009)