Hey
Thanks for the interest, glad it piqued your curiosity. I considered putting an explanation at the start but people have short attention spans (me included).
It's 'temporary' because ...
I pulled it apart at the end
It's built with breadboard and hook up wire not PCB and solder
Hence it's necessarily temporary as it falls apart easily!
Temporary as in there may be others come along to replace it
I need the parts for other projects
... and more importantly I guess, because it's only intended to be a quick exploration of a relatively simple idea ... it aint a concerto or a philosophical treatise 
It's a hardware 'sketch'.
As it stands this piece may or may not warrant a permanent version. It would certainly be nice to take some of the ideas into something permanent tho. I'm really interested in doing some large installations of 'collaborative music machines'.
Also by giving it a kind of generic name I'm hopefully suggesting other people go make temporary music machines too. Take the ideas here and run with them, see what happens.
Jim