Kinetic sculpture at the BMW Museum by Joachim Sauter

740 metallic orbs amazingly dance around and form shapes in mid-air in BMW Munich Germany.
Thes metal spheres can move vertically through small steel wires that are controlled by motors to display the process of form finding. 

Books of  Joachim Sauter
Digital Media Design Yearbook 2008 Joachim Sauter Jussi Ängeslevä 

Beauty of Data Joachim Sauter Jussi Ängeslevä (Paperback - Jan 1, 2008)

Source:http://www.interactiondesignblog.com/2009/05/hovering-balls-kinetic-sculpture/