Haus in Schwarz (House in Black) was a 2008 public art piece by artists Erik Sturm and Simon Jung (previously) in the city center of Möhringen, Germany. The piece was meant as a farewell to the building which was slated for demolition, with the matte black paint acting as a sort of final curtain to an exterior that had recently been used by numerous street artists, shown bellow.

Klemens Torggler's door is an invention based on rotating squares, The special construction makes it possible to move the door sideways without the use of tracks. This technical trick opens up new applications for the door.