Hi,
The „graped piano“ is shown on the CodemotionWorld 2015 in Berlin from 2.-3. November (MakerSpace).
http://berlin2015.codemotionworld.com/program/makerspace/
Graped piano meets MakerSpace of codemotionworld
Linux: 3D print, robotic, rt-kernel, and microcontroller
Georg Mill's BLOG for Linux, 3D print, robotic and microcontroller