This is a trailer for Trimpin: The Sound of Invention, a documentary film about engineer, sound artist, and inventor, Trimpin. The film is currently showing on the festival circuit. One part shows how Trimpin rigged up a load of guitar robots to make the famous tower of guitars sculpture in the Experience Music Project in Seattle.
The film also shows Trimpin's other work over the last 25 years
Link: Trimpin the Sound of Invention Movie