Here is one additional picture of ConlonInPurple. Trimpin has provided some interesting details on this drawing. (I scanned this from the book mentioned earlier.)
I wanted to add some clarification and more details to this:
The Seismofon sculpture was made by a man named Trimpin. I can't believe I didn't mention that.
In the book "Trimpin: Contraptions for Art and Sound", this instrument is referred to as "Magnitude in C#," however, at the actual museum...
TL;DR Summary: Resonance of a cylinder/tube with a hole in the center
The Science Museum of Minnesota has this really cool xylophone hanging from the ceiling, named "Seismofon":
There is a computer connected that receives almost-real-time seismic activity, and it uses that information to...