112 One million
This exhibit is a challenge that helps understanding of big numbers. After rotating the "1" wheel a couple of hundred thousend revolutions, the "1 mill" wheel will tip off a flask from its shelf. This will only happen a couple of times a year, and the wheel can be reset. Different sounds and lights are activated when some wheels have turned one revolution. A big numeric display indicates the actual number of revolutions, which also are approximately indicated by the black arrows.