According to Wikipedia, "Sympathetic Resonance is a harmonic phenomenon wherein a formerly passive string or vibratory body responds to external vibrations to which it has a harmonic likeness."
Artist Joshua Kirsch has created a musical sculpture based on this principle: a medley of interactive musical "units", all controlled by a human operated keyboard.
"Sympathetic Resonance is an interactive musical instrument sculpture that utilizes the keys of a marimba (a mallet-percussion instrument of African origin) to create four and a half playable octaves. The sculpture consists of 56 'units', each containing a different note, as well as a yarn-wound mallet affixed to a rotary solenoid which allows the note to be triggered by a touch-sensitive aluminum keyboard played by the viewer. The sculpture's modular design allows it to completely change configuration from installation to installation. Each unit can be either mounted or placed on the floor or mounted to a wall, and can be connected to the keyboard with a wire of any length."
Video demonstration below, scroll further down for installation images.
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