Fantastic Music Machine (video)
This incredible machine was built as a collaborative effort between the Robert M. Trammell Music Conservatory and the Sharon Wick School of Engineering at the University of Iowa.
It took the team a combined 13,029 hours of set-up, alignment, calibration and tuning before filming this video. It is now on display in the Matthew Gerhard Alumni Hall at the University and is already slated to be donated to the Smithsonian.

Wow.. this is about precision..
Exactly. All the marbles were retrieved after they were shot out.
Wah lan eh.... are you on the verge of death due to boredom?
No, I'm busy until I have nothing good to post.