The Grazer double spiral staircase as a twin spiral staircase (as its official name) was built in the years 1499 to 1500 in the reign of the German king and later Emperor Maximilian I by an unknown master builder of a medieval building in the castle of Steinmetzen. The Graz staircase is not the only and not the oldest in its form in Central European architecture, but one of the most important. It is characterized by the particularly high quality of the detail execution and the daringness of its construction with hollow spindles. Here comes the experimentation of late Gothic architecture under Emperor Maximilian I expressed. The craftsmanship and geometry of the Grazer Doppelwendel influenced Konrad Wachsmann on the development of the Grapevine study in Chicago in 1953.