German artist Erwin Stache created the interactive installation 83,7 Kilo Ohm. The installation is placed in public space, inviting passers-by to touch it, play with it and thus create their own sound and music with it. If more people touch the installation, they can also shake hands and touch each other to influence the sound.
Each time two or more of the metal tubes are touched, the sound, playing from the speaker attached to the base, is triggered and manipulated. Some of the (more interesting, if you ask me) parts are more abstract, electronic sounding, while others are precomposed pieces of music a participant can ‘conduct’.
Found on brainpickings.org