When I visited the Bauhaus, I passed this installation on the way from the train station:

It's called the "Expowurm," and if I had to guess, I would say it was for displaying projects. There was, unfortunately, no literature or people hanging around. It was some sort of membrane stretched over a wooden frame.

The interior could feasibly house temporary exhibits. Though the construction itself may well be a temporary exhibit. It's definitely not secure, because I wiggled up through one of the openings in the bottom to look around inside, because the doors (plain glass doors on each end) were locked.