The four-storied former K&K Telegrafenamt (Imperial and Royal telegraph office), built from 1870 to 1873, has been vacant for the last twenty years. It was only used for special events like theatrical productions or an art fair. Reportedly the edifice will soon be converted into offices and high-class apartments. When I was inside the edifice during an art fair in 2013 these swing doors caught my eyes.
Click here to view thumbnails of all participants in the theme day.