For Class 15 at Fab Academy 2013 in Amsterdam ("mechanical design, machine design"), We decided to make a visual feedback for the doorbell in the Lab in the form of a Polargraph/Drawbot/polar pen-plotter.

The design, development, implementation and design-files are documented in several pages accessible by the dropdown-menu above.
The images below show the finished Machine.

A picture of the finished machine will magically appear here in due course.....