Monochord / Instillation Idea?

At the beginning of the semester, I was looking across new instruments (new to me) and came across the monochord. Although smaller monochords do exist, I am most intrigued by the large ones.

The beauty of the monochord is how easy it is play. This goes against what I'm trying to build as an instrument for my current project, but has me already thinking ahead to how I could apply a certain aspect of this to some kind of instillation. Though I do not necessarily want to work with the idea of strings (even though that is a possibility), I would really like to build something like this: Its function is apparent, its easy to play, and the simple drone-like sound is extremely soothing. I think bringing those aspects to an interactive instillation would be extremely interesting.